A Study to Evaluate Safety and Efficacy of Ocrelizumab in Comparison With Fingolimod in Children and Adolescents With Relapsing-Remitting Multiple Sclerosis (RRMS)

Inclusion Criteria: * Body weight ≥ 25 kilograms (kg) * Diagnosis of RRMS in accordance with the International Pediatric Multiple Sclerosis Study Group (IPMSSG) criteria for pediatric Multiple Sclerosis (MS), Version 2012, or McDonald criteria 2017 * Expanded Disability Status Scale (EDSS) at screening: 0-5.5, inclusive * For all countries except Germany, at least one MS relapse during the previous year or two MS relapses in the previous 2 years or evidence of at least one Gd enhancing lesion on MRI within 6 months Inclusion Criteria for Optional OLE Period: -Participants in Group A (ocrelizumab in the double-blind period \[DBP\]) and Group B (fingolimod in the DBP) who, in the opinion of the investigator, may benefit from switching to ocrelizumab and who have completed the DBP with study treatment (ocrelizumab/fingolimod), may participate in the OLE period Exclusion Criteria: * Known presence or suspicion of other neurologic disorders that may mimic MS * Significant uncontrolled somatic diseases, known active infection or any other significant condition that may preclude participant from participating in the study * Participants with severe cardiac disease or significant findings on the screening Electrocardiograph (ECG) Exclusion Criteria for Optional OLE Period: -Participants who have discontinued the study during the DBP