The GPON system can realize the security of Internet service data forwarding. Which one is wrong in the description of the data security plan?

The GPON system can realize the security of Internet service data forwarding. Which one is wrong in the description of the data security plan?
A . It is recommended to use the QINQ VLAN attribute for the SVLAN on the OLT, which is convenient for users to deploy PPPoE+/Opton82, MAC anti-attack/anti-spoofing and other security features
B . The outer SVLAN can be allocated based on OLT equipment, PON board or PON port
C . It is recommended that the value of CVLAN be associated with the PON port, optical splitter and ONU port to ensure the uniqueness of CVLAN and facilitate positioning
D . Based on refined QoS control and management of users and services, Internet access services should be planned in the way of PUPSPV (per user per service per VLAN)

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Answer: C