Open-label Study Comparing Iberdomide, Daratumumab and Dexamethasone (IberDd) Versus Daratumumab, Bortezomib, and Dexamethasone (DVd) in Participants With Relapsed or Refractory Multiple Myeloma (RRMM)

Inclusion Criteria * Documented diagnosis of multiple myeloma (MM) and measurable disease. * Received 1 to 2 prior lines of anti-myeloma therapy. * Must have documented disease progression during or after their last anti-myeloma regimen. * Eastern Cooperative Oncology Group (ECOG) performance status score of 0, 1 or 2. Exclusion Criteria * Any condition that confounds the ability to interpret data from the study. * Has plasma cell leukemia, Waldenstrom's macroglobulinemia or POEMS syndrome (polyneuropathy, organomegaly, endocrinopathy, monoclonal protein, and skin changes), or clinically significant amyloidosis. * Known central nervous system involvement with MM. * Prior therapy with iberdomide. * Other protocol-defined Inclusion/Exclusion criteria apply.