When the Trunk port send the data frame, how to deal with?

When the Trunk port send the data frame, how to deal with?
A . When the VLAN ID is the same as the PVID of the port and is a VLAN ID allowed by the port, remove the Tag and send the message
B . When the VLAN ID is different from the PVID of the port, the data frame is dropped
C . When the VLAN ID is different from the PVID of the port, replace it with PVID forwarding
D . When the VLAN ID is different from the PVID of the port, strip off the TAG and forward

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Answer: A