What is the implication of using Deferred versus Concurrent firmware updates?（）

A.Deferred firmware updates require a reboot to be applied, while concurrent updates do not.
B.Deferred firmware updates require a full power IPL to be applied while concurrent updates do not.
C.Concurrent firmware updates require all LPARs to be quiesced and shutdown prior to initiating the update, while deferred updates do not.
D.Concurrent firmware updates can be applied to multiple managed systems in parallel, while eferred updates must be applied sequentially.