A Multiple-center, Non-randomized, Open-label, Adaptive, Single-ascending Dose (Part 1 and Part 2) and Multiple-ascending Dose (Part 3) Parallel, Phase IB Study to Investigate the Safety, Tolerability, Immunogenicity, Pharmacokinetics, and Pharmacodynamics of RO7121932 Following Intravenous (Parts 1) and Subcutaneous Administration (Parts 2 and 3) in Participants With Multiple Sclerosis | Arctuva