Which statements must be true before an IEEE 802.11 station may transmit a Data frame on the RF medium using DCF?
A.
The Network Allocation Vector must be equal to zero.
B.
A time period of at least PIFS must have passed.
C.
The station must have received a PS-Poll frame from the access point.
D.
The Backoff Timer must be equal to zero.
E.
The channel has been inactive for at least DIFS.
F.
All collision detection must be completed on the RF medium.