What is the function of the command switchport trunk native vlan 999 on a trunk port?
A.
It designates VLAN 999 for untagged traffic.
B.
It blocks VLAN 999 traffic from passing on the trunk.
C.
It creates a VLAN 999 interface.
D.
It designates VLAN 999 as the default for all unkown tagged traffic.
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