A Study to Assess A Change in Disease Activity and Adverse Events of Intravenous Etentamig and Daratumumab (Etentamig+D) Compared to Daratumumab, Lenalidomide, and Dexamethasone (DRd) in Adult Participants With Newly Diagnosed Multiple Myeloma Not Eligible for Transplant

Inclusion Criteria: * Participants must have confirmed new diagnosis of multiple myeloma (NDMM) according to the International Myeloma Working Group (IMWG) diagnostic criteria, and per investigator's judgement, participant is not suitable to receive high-dose chemotherapy and stem cell transplantation due to factors likely to have a negative impact on tolerability of high dose chemotherapy and autologous stem cell transplants (ASCT). * IMWG Myeloma Frailty Index Score of \>= 1 * All participants must have measurable disease per central laboratory with at least 1 of the following assessed within 28 days prior to enrollment: * Serum M-protein \>= 0.5 g/dL (\>= 5 g/L). * Urine M-protein \>= 200 mg/24 hours. * Serum free light chain (FLC) \>= 100 mg/L (\>= 10 mg/dL) (involved light chain) and an abnormal serum kappa lambda ratio only for participants without measurable serum or urine M-protein. Exclusion Criteria: * Prior or current systemic therapy or stem cell transplant (SCT) for multiple myeloma or any plasma cell dyscrasia other than short course of corticosteroids * Participant treated with any investigational treatment within 30 days or 5 half-lives of the treatment (whichever is longer) prior to the first dose of study treatment or is currently enrolled in another clinical study * Participant who has known active central nervous system involvement of MM. * Participant who has history of clinically significant renal, neurologic, psychiatric, endocrine, metabolic, immunologic, pulmonary, or hepatic disease within the last 6 months that, in the investigator's opinion, would adversely affect the participant's participation in the study.