Which statement about the qos pre-classify command is true?

Which statement about the qos pre-classify command is true?

A.
The qos pre-classify command is entered in global configuration mode.

B.
The qos pre-classify command is entered in priveleged EXEC mode.

C.
The qos pre-classify command is not necessary when the classificaiton policy matches on the ToS byte.

D.
The qos pre-classify command cannot be applied to an IPsec GRE tunnel.