Which of the following statements regarding MUX VLAN is true?

Which of the following statements regarding MUX VLAN is true?
A . The MUX VLAN contains a principal VLAN and subordinate VLANs. The principal VLAN and subordinate VLANs cannot communicate.
B . The MUX VLAN contains a principal VLAN and subordinate VLANs. The subordinate VLANs are classified into subordinate separate VLANs and subordinate group VLANs. The interfaces in the subordinate group VLAN can communicate with each other.
C . The interfaces between subordinate separate VLANs can communicate with each other, but cannot communicate with the interfaces in the principal VLA
E . The principal VLAN and subordinate VLANs cannot communicate.

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Answer: B