About the report of the OTUk_BDI alarm, which of the following statement is wrong?
A . Only WDM-side ports will report OTUk_BDI
B . The OTU board corresponding to the downstream station receives OTUk_AIS
C . The OTU board corresponding to the downstream station receives the OTUk_TIM
D . The OTU board corresponding to the downstream station receives the OTUk_SSF
Answer: A