What function does the dial plan perform when using a gatekeeper?

What function does the dial plan perform when using a gatekeeper?

A.
The dial plan issues instructions to the gatekeeper to reallocate bandwidth.

B.
The dial plan allows devices to find the correct gatekeeper.

C.
The dial plan determines the action to be taken when a call is rejected by the gatekeeper.

D.
The dial plan controls the amount of bandwidth to request from the gatekeeper.