A study to Evaluate the Efficacy and Safety of Avelumab in Combination with Chemotherapy.  A Randomized, Open-Label, Multicenter, Phase 3 Study to Evaluate the Efficacy and Safety of Avelumab in Combination with Chemotherapy Followed by Maintenance Therapy of Avelumab in Combination With the Poly (Adenosine Diphosphate [ADP]-Ribose) Polymerase (PARP) Inhibitor Talazoparib in Patients With Previously Untreated Advanced Ovarian Cancer
(JAVELIN Ovarian PARP 100).