Which of the following descriptions of ODUk SNCP protection type is wrong?

Which of the following descriptions of ODUk SNCP protection type is wrong?
A . When the protection subtype is "SNC/I, there is no need to set the OTN overhead. However, when configuring this type of protection, both ends of the service must be within the range of SM overhead monitoring;
B . The protection subtype is "SNC/S": monitors the PM layer and needs to set the OTN overhead;
C . For boards that require ODUk SNCP protection and electrical cross-connection, the configuration varies depending on the selected board and customer-side services;
D . The ODUk SNCP protection configuration of the receiving site needs to be consistent with the ODUk SNCP protection configuration of the sending site;

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Answer: B