Which QoS preclassification option will require the use of the qos pre-classify command for the VPN traffic?

Which QoS preclassification option will require the use of the qos pre-classify command for the VPN traffic?

A.
VPN traffic needs to be classified based on the Layer 2 header information.

B.
VPN traffic needs to be classified based on the IP precedence or DSCP.

C.
VPN traffic needs to be classified based on IP flow or Layer 3 information, such as source and destination IP address.

D.
VPN traffic with Authentication Header (AH) needs to preserve the ToS byte.