Which two QoS mark methods can a service use to mark user traffic and be visible only internally to the router? (Choose two)

Which two QoS mark methods can a service use to mark user traffic and be visible only internally to the router? (Choose two)
A . 802.1p
B . DS-TE
C . discard-class
D . ToS
E . QoS-group
F . MPLS EXP bits
G . DSCP

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Answer: C, E