The Cisco AutoQoS feature is being used throughout the Company VOIP network.  Which three  statements about this feature are true？（）

A.The mls qos global configuration command must be entered before configuring AutoQoS.

B.CEF must be enabled.

C.The no auto qos voip command is used to disable Cisco AutoQos and revoke all  configurations generated by Cisco AutoQos.

D.CDP must be enabled.

E.SNMP must be enabled.