Why C? Based on the hcia wlan notes, this is what I've gathered:
The AP sends a Configuration Status Request message carrying the AC name
and radio information to the AC and starts a timer for waiting for a
Configuration Status Response message.
• After receiving the Configuration Status Request message, the AC changes its
status and sends a Configuration Status Response message. (Currently, no
configuration is delivered in this phase. The configuration is delivered after
the AC enters the Run phase.) After receiving the Response message, the AP
stops the timer and enters the Data Check phase