When the link type of the  ONU  port is  Trunk  , its processing method for upstream packets is  _____  .

When the link type of the  ONU  port is  Trunk  , its processing method for upstream packets is  _____  .
A . only allowed without  Tag  packets to pass through, and the packets add the default  VLAN  of  Tag
B . Only allow the packets with the default  LAN Tag  to pass and go to the  tag
C . for without receipt of the  Tag  message, add the default  VLAN Tag  ; for received with  Tag  packets forwarded directly
D . Only allow  tagged  messages to pass

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Answer:   C