When the link type of the  ONU  port is  Access  , its processing method for downstream messages is  ____  .

When the link type of the  ONU  port is  Access  , its processing method for downstream messages is  ____  .
A . Only allow packets without  tags  to pass, and  add  the default  VLAN tag  to the packets
B . Only the packets with the default  VLAN tag  are allowed to pass and go to the  tag
C . for without receipt of the  Tag  message, add the default  VLAN Tag  , to receive with  Tag  packets forwarded directly
D . Only allow  tagged  messages to pass

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Answer:   B