When the OLT processes priority marks, which methods that can be adopted? (Multiple choice)

When the OLT processes priority marks, which methods that can be adopted? (Multiple choice)
A . From the outer layer Tag 802.ip priority of the ingress message to hold shell/map
B. Copy the ToS value of the ingress packet
C. From the inner layer Tag 802.ip priority support/mapping of the ingress message
D. Directly specify the configuration

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Answer: ABCD