Which two Cisco AutoQoS configuration statements are true? (Choose two)

Which two Cisco AutoQoS configuration statements are true? (Choose two)

A.
The auto discovery qos command is supported on serial interfaces, subinterfaces, and virtual interfaces.

B.
CEF must be enabled before configuring the auto qos discovery command.

C.
The auto qos privelege EXEC command must be configured on a router for several days to collect a sampling of data traffic.

D.
The auto qos trust command relies on NBAR to provide VoIP classification.

E.
The auto qos voip command configures the VoIP classificaiton on routers and switches.