问题：

[多选] Which two statements or sets of statements are true about the application of the qos pre-classify command？（）

A .  If the classification policy is based upon the ToS byte， the qos pre-classify command is required because the ToS byte only appears in the inner IP header.
B .  The ToS byte is copied to the outer header by default. Therefore， the qos pre-classify command is not necessary.
C .  With GRE encapsulation， the qos pre-classify command is applied on the tunnel interface. This practice allows for different OoS configurations on each tunnel.
D .  With GRE encapsulation， the qos pre-classify command is applied on the physical interface. This practice allows for different OoS configurations on each interface.
E .  With IPsec encapsulation， the qos pre-classify command is applied on the physical interface. This practice allows for different OoS configurations on each interface.