Which two areas does the engineer check to prevent jitter?

An engineer with troubleshoots poor voice quality on multiple calls. After looking at packet captures, the engineer notices high levels of jitter.

Which two areas does the engineer check to prevent jitter? (Choose two.)
A . Voice packets are classified and marked.
B . All devices use wired connections instead of wireless connections.
C . The network meets bandwidth requirements.
D . Cisco UBE manages voice traffic, not data traffic.
E . MTP is enable on the sip trunk to cisco Unified Border Element.

Answer: A,C