In IEEE 802.1ad deployments, which three represent valid port modes? (Choose three)

In IEEE 802.1ad deployments, which three represent valid port modes? (Choose three)
A . UNI C-port
B . NNI untagged
C . NNI S-port
D . UNI untagged
E . NNI C-port
F . NNI
G . UNI S-port
H . UNI T-port

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Answer: A, F, G