Please select the eligibility criteria that correspond to the clinical trial below.
Title: A Multicenter, Observational, Open-Label, Single-Arm Study of Tysabri in Early Relapsing-Remitting Multiple Sclerosis in Anti-JCV Antibody Negative Patients
Brief Summary: The primary objective of the study is to determine which baseline and yearly response factors (clinical and para clinical) predict overall disease-free status at Month 12 and Month 24, and clinical disease-free status in subsequent Months 36 and 48. The secondary objectives are: To identify prognostic factors at Baseline that predict overall disease-free status at Month 12, and to assess if yearly overall disease-free response factors predict overall disease-free status at Month 24; To evaluate clinical disease-free status (relapse, Expanded Disability Status Scale \[EDSS\]) at each analysis time point of Months 12, 24, 36, and 48; To identify prognostic factors at Baseline that predict clinical disease-free status at Month 12, and to assess yearly clinical disease-free response factors that predict clinical disease-free status (relapse, EDSS) in subsequent years at Months 24, 36, and 48; To evaluate the impact of Tysabri at each analysis time point of Months 12, 24, 36, and 48 on the following: annualized relapse rate (ARR), sustained EDSS progression and improvement (24-week sustained); To evaluate the impact of Tysabri at each analysis time point of Months 12, 24, 36, and 48 on the following: magnetic resonance image (MRI) measures: T2, T1, T1 with Gadolinium (Gd), brain atrophy; To evaluate the impact of Tysabri at Month 24 and Month 48 on the following: optical coherence tomography (OCT), Low and High Contrast Visual Acuity Assessment; To evaluate the impact of Tysabri at each analysis time point of Months 12, 24, 36, and 48 on the following: cognitive impairment (Symbol Digit Modalities Test \[SDMT\]), capacity for work (Work Productivity and Activity Impairment Questionnaire \[WPAI\]), quality of life (QoL) (Multiple Sclerosis Impact Scale \[MSIS-29\])


Options:
A: Inclusion Criteria:

1. Subjects must have a confirmed and documented MS diagnosis as defined by the Revised McDonald criteria with a relapsing-remitting disease course.
2. Subjects must be ambulatory with an EDSS score of 0-5.5 in both screening and baseline visits.
3. Subjects must be in a relapse-free, stable neurological condition and free of corticosteroid treatment \[intravenous (IV), intramuscular (IM) and/or per os (PO)\] or ACTH 30 days prior to screening (month -1) and between screening and baseline (month 0) visits.
4. Subjects must have experienced one of the following:

   At least one documented relapse in the 12 months prior to screening, or At least two documented relapses in the 24 months prior to screening, or One documented relapse between 12 and 24 months prior to screening with at least one documented T1-Gd enhancing lesion in an MRI performed within 12 months prior to screening.
5. Subjects must be between 18 and 55 years of age, inclusive.
6. Women of child-bearing potential must practice an acceptable method of birth control.
7. Subjects must be able to sign and date a written informed consent prior to entering the study.
8. Subjects must be willing and able to comply with the protocol requirements for the duration of the study

Exclusion Criteria:

1. Subjects with progressive forms of MS.
2. Use of experimental or investigational drugs, and/or participation in drug clinical studies within the 6 months prior to screening.
3. Use of immunosuppressive (including Mitoxantrone and Fingolimod) or cytotoxic agents within 6 months prior to the screening visit.
4. Use of natalizumab (Tysabri®) or any other monoclonal antibodies within 2 years prior to screening.
5. Use of cladribine within 2 years prior to screening.
6. Previous treatment with immunomodulators (including IFNβ 1a and 1b, and IV Immunoglobulin (IVIg) within 2 months prior to screening.
7. Previous use of GA or any other glatiramoid.
8. Chronic (more than 30 consecutive days) systemic (IV, PO or IM) corticosteroid treatment within 6 months prior to screening visit.
9. Previous total body irradiation or total lymphoid irradiation.
10. Previous stem-cell treatment, autologous bone marrow transplantation or allogenic bone marrow transplantation.
11. Pregnancy or breastfeeding.
12. Subjects with a clinically significant or unstable medical or surgical condition that would preclude safe and complete study participation, as determined by medical history, physical exams, ECG, abnormal laboratory tests and chest X-ray. Such conditions may include hepatic, renal or metabolic diseases, systemic disease, acute infection, current malignancy or recent history (5 years) of malignancy, major psychiatric disorder, history of drug and/or alcohol abuse and allergies that could be detrimental according to the investigator's judgment.
13. A known history of sensitivity to Gadolinium.
14. Inability to successfully undergo MRI scanning.
15. A known drug hypersensitivity to Mannitol.
B: Key Inclusion Criteria:

* Documented diagnosis of Relapsing Multiple Sclerosis (McDonald 2010 Criteria ).
* \<3 year disease duration.
* Must have an Expanded Disability Status Scale (EDSS) score from 0 to 4.0, inclusive.
* Anti-JCV antibody negative test within 6 months of Screening Visit.
* Must satisfy the approved therapeutic indications for Tysabri.
* Must be treatment-naïve to disease-modifying therapy (DMT) or have been treated with DMT (including but not limited to Avonex, Betaseron, Rebif, Copaxone, Extavia, or Gilenya) for ≤36 months total prior to date of informed consent.
* Decision to treat with Tysabri must precede enrollment.

Key Exclusion Criteria:

* Any prior treatment with Tysabri.
* Anti-JCV antibody positive at any timepoint prior to the Screening Visit.
* Contraindications to treatment with Tysabri as described in the US Prescribing Information.
* History of progressive multifocal leukoencephalopathy (PML) or other opportunistic infections, or an increased risk for such infections.
* History of diagnosis of Primary Progressive Multiple Sclerosis (PPM) and/or Secondary Progressive Multiple Sclerosis (SPMS).
* Receiving immunomodulatory or immunosuppressive therapy.
* Prior history of immunosuppressive use (mitoxantrone, azathioprine, methotrexate, cyclophosphamide, mycophenolate, cladribine, rituximab).
* Immunocompromised at the time of enrollment.
* Known active malignancies (subjects with cutaneous basal cell carcinoma that has been completely excised prior to study entry remain eligible).
* Women breastfeeding, pregnant, or planning to become pregnant; women who are not post-menopausal or surgically sterile who are unwilling to practice contraception.
* Inability to comply with study requirements.

NOTE: Other protocol defined Inclusion/Exclusion criteria may apply.
C: Key Inclusion Criteria:

* Capable of understanding and complying with the protocol
* Has a confirmed diagnosis of RRMS
* Neurologically stable with no evidence of relapse within 30 days prior to randomization
* Agrees to use an acceptable method of contraception for the duration of the study and for 30 days after any study drug administration, or is surgically sterile or post-menopausal

Key Exclusion Criteria:

* Have any finding(s) that would compromise the safety of the subject, affect the subject's ability to adhere to the protocol visit schedule or to fulfill visit requirements, or would make the subject unsuitable for participation in the study
* Diagnosis of primary progressive, secondary progressive, or progressive relapsing MS
* History of clinically significant cardiovascular, pulmonary, GI, dermatologic, psychiatric, neurologic (other than MS), endocrine, renal, and/or other major disease that would preclude participation in a clinical trial
* History of GI surgery (except appendectomy that occurred more than 6 months prior to screening
* History of clinically significant recurring or active gastrointestinal symptoms (eg, nausea, diarrhea, dyspepsia, constipation) within 3 months of screening
* Chronic use (7 days) of medical therapy to treat any GI symptoms within 1 month of screening Has a clinically significant medical condition or observed abnormality at screening
* History of a myocardial infarction, including a silent myocardial infarction or unstable angina
* History of clinically significant drug or alcohol abuse within the past year prior to screening
* Clinically significant history of suicidal ideation or suicidal behavior in the last 12 months
* Subject is pregnant or breastfeeding or plans to become pregnant or begin breastfeeding at any point during the study and for 30 days after any study drug administration
* Prior use of Dimethyl Fumarate (DMF)

NOTE: Other protocol defined Inclusion/Exclusion criteria may apply.
D: Key Inclusion Criteria:

-Subjects who participated in and completed as per protocol previous BG00012 clinical studies 109MS301 (NCT00420212) or 109MS302 (NCT00451451).

Key Exclusion Criteria:

* Any significant change in medical history from 109MS301 or 109MS302 that would have excluded subject's participation from their previous study.
* Subjects from 109MS301 or 109MS302 who discontinued oral study treatment due to an AE or due to reasons other than protocol-defined relapse/disability progression.
* Subjects from 109MS301 or 109MS302 who discontinued study treatment due to disability progression or relapses and did not follow the modified visit schedule up to Week 96.

NOTE: Other protocol defined Inclusion/Exclusion criteria may apply.

Answer: B