Why is adding users to the CCM directory important?

A.
Different toll rates can be assessed if you add the users to the directory.

B.
Better routing decisions can be made if you add the user to the directory.

C.
The phone is not usable unless users are added and associated with a phone.

D.
The users will not be able to use directory services until they are added to the directory.

Explanation:
The correct answer is definitely not C, it is probably A. Phones do not have to be associated with users. Phones in Call Manager can very well not be associated with any users. Anyone who thinks C is the correct answer has never worked with Call Manager.