Please assess the completion status of the following clinical trial:

Trial Title: Phase 2 Study of BIIB092 in Participants With Early Alzheimer's Disease

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE2
- Number of Arms: 4.0

Eligibility Criteria:
Key Inclusion Criteria:~* Must have a gradual and progressive change in memory function over more than 6 months.~* Must meet all of the clinical criteria for mild cognitive impairment (MCI) due to Alzheimer's disease (AD) or mild AD and must have~* Objective evidence of cognitive impairment at Screening~* Clinical Dementia Rating Scale (CDR) global score of 0.5 for MCI due to AD or 0.5 or 1 for mild AD~* Mini-Mental State Examination (MMSE) score of 22 to 30 (inclusive)~* CDR Memory Box score of ≥0.5~* Must consent to apolipoprotein E (ApoE) genotyping~* Must have 1 informant/study partner~* Must have amyloid beta positivity confirmed at Screening~Key Exclusion Criteria:~* Any medical or neurological/neurodegenerative condition (other than AD) that, in the opinion of the Investigator, might be a contributing cause to the participant's cognitive impairment or could lead to discontinuation, lack of compliance, interference with study assessments, or safety concerns~* Clinically significant, unstable psychiatric illness~* Have had a stroke or Transient Ischemic Attack (TIA) or unexplained loss of consciousness in the past 1 year~* Relevant brain hemorrhage, bleeding disorder and cerebrovascular abnormalities~* History of unstable angina, myocardial infarction, chronic heart failure or clinically significant conduction abnormalities within 1 year prior to Screening Visit 1~* Indication of impaired renal or liver function~* Alcohol or substance abuse in past 1 year~* Clinically significant systemic illness or serious infection within 30 days prior to or during the screening period~* Use of allowed medications for chronic conditions at doses that have not been stable for at least 4 weeks prior to Screening Visit 1 and during the screening period up to Study Day 1, or use of AD medications at doses that have not been stable for at least 8 weeks prior to Screening Visit 1 and during the screening period up to Study Day 1.~* Use of any medications that, in the opinion of the Investigator, may contribute to cognitive impairment, put the participants at higher risk for adverse events (AEs), or impair the participant's ability to perform cognitive testing or complete study procedures.~* Contraindications to study procedures~NOTE: Other protocol defined Inclusion/Exclusion criteria may apply

- Gender: ALL
- Minimum Age: 50 Years
- Maximum Age: 80 Years
- Healthy Volunteers: f

Study Arms:
- Low-dose BIIB092 (Type: EXPERIMENTAL): Intravenous (IV) infusion once every 4 weeks OR once every 12 weeks and placebo at the other 4-week dosing visits to maintain the treatment blind.
- Medium-dose BIIB092 (Type: EXPERIMENTAL): Intravenous (IV) infusion once every 4 weeks.
- High-dose BIIB092 (Type: EXPERIMENTAL): Intravenous (IV) infusion once every 4 weeks.
- Placebo (Type: PLACEBO_COMPARATOR): Intravenous (IV) infusion once every 4 weeks.

Based on this trial design, predict the completion outcome and termination type (if applicable).

Answer: outcome: terminate
termination_type: lack of efficacy