What will an endpoint do when an H.323 endpoint requires a change to a higher bit rate codec during a call?

A.
Send a Bandwidth Reject (BRJ) to the gatekeeper.

B.
Send a Bandwidth Interrupt (BRI) to the gatekeeper.

C.
Send a Bandwidth Request (BRQ) to the gatekeeper.

D.
Send a Disengage Request (DRQ) to the gatekeeper.

E.
Send a Change Codec Request (CCR) to the gatekeeper.