In the FTTX network, which of the following principles is wrong when planning data for broadband services?

In the FTTX network, which of the following principles is wrong when planning data for broadband services?
A . If the outer labels of different PON ports are different, the inner labels can be the same
B . The same PON port is marked with different outer labels for different services
C . If the outer labels of different PON ports are the same, the inner labels cannot be the same
D . The network management should use QinQ VLAN

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Answer: D