When LOATOA/THA/TOMTOG and other single board services are activated, the client-side interface of this end reports a SYNC alarm. What is the reason?

When LOATOA/THA/TOMTOG and other single board services are activated, the client-side interface of this end reports a SYNC alarm. What is the reason?
A . The client-side interface on this end receives light abnormally, and the client-side interface on the other end receives light abnormally
B . The client-side interface on this end receives light normally, but the client-side interface on the other end receives light abnormally
C . The port receives light normally, and the client-side port receives light normally
D . The client-side interface on this end receives light abnormally, while the client-side interface on the other end receives light normally

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Answer: D