The purpose of this study is to evaluate the safety and efficacy of NU100 in patients with relapsing remitting multiple sclerosis (RRMS) as compared to placebo and an active comparator. The primary clinical objective selected for this Phase 3 study, the cumulative number of new combined unique active lesions (CALs; defined as new gadolinium T1-weighted lesions and non-enhancing new and newly enlarging T2-weighted lesions) on magnetic resonance imaging (MRI) scans over the course of 4 and 12 months of treatment to demonstrate the superiority of NU100 to placebo and the non-inferiority of NU100 to Betaferon®, respectively.