During the implementation of a voice solution, which two required items are configured at an
access layer switch that will be connected to an IP phone to provide VoIP communication?
(Choose two.)

A.
allowed codecs

B.
untagged VLAN

C.
auxiliary VLAN

D.
Cisco Unified Communications Manager IP address

E.
RSTP

Explanation:
Reference: http://networkingnerd.net/2012/05/09/switchport-voice-vlan-post/