What must occur before an HT STA operating in an EDCA BSS can transmit a data frame over the wireless
medium? (Choose 3)

A.
Its NAV must be equal to one.

B.
The STA must receive a BlockAck, resetting the NAV to zero.

C.
The appropriate interframe space must expire.

D.
The backoff timer for the AC must equal zero.

E.
Its CCA must report that the medium is idle.

F.
The AP must issue the STA a TXOP.