The correct answer is D. HPE Primera Peer Persistence and Active Peer Persistence designs use HPE Quorum Witness to support automatic failover decisions between arrays. The Quorum Witness is deployed as a virtual appliance, typically from an OVA image, and is placed in a third failure domain so that it can arbitrate between the two storage systems during communication or site-failure scenarios. HPE identifies Quorum Witness as a necessary component for automatic failover between arrays in Peer Persistence and Active Peer Persistence configurations. Option A is incorrect because Nimble/Alletra 6000 Peer Persistence does not make the protected volume independently active through the target array in the same active-active manner. Option B is incorrect because ''Active Peer Persistence'' is associated with Primera/Alletra 9000/B10000-class designs, not classic Nimble terminology. Option C mixes terms: Nimble uses a Witness service for ASO behavior, but ''Quorum Witness via OVA'' is the precise Primera-style statement. Reference/topics: Peer Persistence, Active Peer Persistence, HPE Primera, Quorum Witness, failure-domain arbitration.