The BIG-IP Administrator disables all pool members in a pool.

On BIG-IP, a disabled pool member is deliberately treated differently from a member that is unavailable because of a failed health monitor or one that has been forced offline . Disabling a pool member removes it from normal load-balancing selection for new, unrelated sessions, but BIG-IP can continue sending traffic associated with existing active connections and existing persistence sessions to that member.

F5 documentation states specifically that when a pool member is disabled, it continues to process active connections and connections belonging to the current persistence session. F5 also describes the disabled state as allowing “persistent or active connections” while preventing ordinary new load-balanced connections.

The relevant persistence configuration is attached to the virtual server , making A correct. When a client has an existing persistence record—for example, source-address affinity—the persistence decision can continue directing that client ' s connections to its previously selected pool member even though that member has subsequently been disabled.

Slow Ramp Time serves a different purpose: it gradually increases connection allocation to a newly available pool member so that it is not immediately overwhelmed. It does not explain continued access to disabled members. A persistence profile is not configured on the pool itself, eliminating D.

Study Guide References/Topics: Pool Member States; Disabled versus Forced Offline; Persistence Profiles; Virtual Server Persistence; Connection Processing; Slow Ramp Time.