A station has successful received a frame. Which statements are true regarding the acknowledgement procedures in an IEEE 802.11 WLAN?
A.
Broadcast frames are acknowledged by all client stations participating in PCF mode.
B.
Data frames are not acknowledged if the layer 4 protocol is TCP because TCP has its own ACK frames. UDP datagrams are always acknowledged.
C.
Multicast frames are acknowledged by client stations participating in the multicast data stream only.
D.
PS-Poll frames may be acknowledged either with an ACK frame or with a Data frame.
E.
Directed management frames such as authentication and association requests are always acknowledged.
F.
Data frame retransmissions are not acknowledged if they are fragmented.