Which statements are true regarding frame acknowledgement in an IEEE 802.11 WLAN?

A.
ACK frames following Data frames with the More Fragments bit set to 1 set the NAV of competing stations for a duration value equal to two SIFS plus the next Data fragment and its ACK.

B.
A client station’s Reassociation Request frames are only acknowledged with a Reassociation Response from the access point when roaming in a WLAN secured with IEEE 802.1X/EAP.

C.
Probe request acknowledgement (sending of a Probe Response frame) is configurable in the access point and is always linked to SSID broadcast configuration in Beacons.

D.
In an EDCA BSS, encrypted Data frames are only acknowledged by client stations, never by access points.

E.
Data frame fragments are acknowledged individually (with an ACK frame).