Requiring all frames to be transmitted as A-MPDU frames increases performance due to which of the following? (Choose all that apply.)

Requiring all frames to be transmitted as A-MPDU frames increases performance due to which of the following? (Choose all that apply.)
A . Frame overhead is reduced.
B . Block ACK is required.
C . Frame information is shifted from the MPDU header to the PLCP header.
D . Reduced Interframe Space (RIFS) decreases the amount of time between frames.
E . A-MSDU is required; A-MPDU is optional.

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Answer: AB