When a client station sends a broadcast probe request frame with a wildcard SSID, how do APs respond?

A.
After waiting a SIFS, all APs reply at the same time with a probe response.

B.
After waiting a SIFS, a designated AP sends an ACK, and then replies with a probe response.

C.
Each AP checks with the DHCP server to see if it can respond and then acts accordingly.

D.
For each probe request frame, only one AP may reply with a probe response.

E.
Each AP responds in turn after preparing a probe response and winning contention.