Multi-select problem: How does the next paragraph end?

How to become an mri technician
Learn about the responsibilities of mri technicians.
An mri machine is a magnetic resonance imaging machine, which uses magnetic fields to create two-and three-dimensional images of parts of a patient's body to help with treatment and diagnosis. An mri technician is responsible for operating an mri machine to conduct tests on patients.

OPTIONS:
(i) Your hospital might have an mri technician or other technicians work under your supervision. They will identify which parts of your body need treatment, which ones to deliver treatments to, and how often.;
(ii) A technician uses magnetic fields to create images in patients. The technician doesn't use magnetic fields to separate tissue from the body.;
(iii) They use magnetic microphones to monitor the electrical processing of the mri machine and test it to ensure it's working properly. A tube is inserted into the machine at a fixed height for each participant to move and perform various scans.;
(iv) First off, you will need a great deal of technical knowledge to operate an mri machine. You need a thorough understanding of how the technology works as you'll be operating the machine and may be responsible for detecting any problems a hospital's mri machine might display.;
(iv)