which two purposes is the Display parameter designed to be used?

On an IP phone line appearance, for which two purposes is the Display parameter designed to be
used? (Choose two.)

A.
display a number other than the directory number of the IP phone

B.
display a name instead of the directory number of the IP phone

C.
internal caller ID

D.
external caller ID

E.
full directory number ID for outgoing calls

Explanation:
Link:

http://cisco.biz/en/US/docs/voice_ip_comm/cucmbe/admin/8_6_1/ccmsys/a03dn.html#wp1100362