Which one best describes the EAP Identity Request frame when a wireless client is connecting to a Cisco WLC v7.0-based AP WLAN?

A.
sourced from the Cisco ACS Server to the client

B.
sourced from the client to the Cisco ACS Server

C.
sourced from the WLC to the client

D.
sourced from the client to the WLC

E.
sourced from the AP to the client

F.
sourced from the client to the AP

Explanation: