Which of the following statements about OTN overhead is correct? (Multiple choice)

Which of the following statements about OTN overhead is correct? (Multiple choice)
A . The bit value of BDI in the SM/TCMi/PM overhead field (bit 5 of the third byte) of 5 consecutive frames is "1", which will generate BDI
B. BIP-8 bit errors in SM, PM, and TCM monitor bit errors in different areas of different layers in OTN
C. In the OTN frame structure, only SM overhead has IAE and BIAE functions
D. Both TCM and PM have ODUK-LCK, ODUK-OCI, ODUK-AIS three kinds of maintenance information

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Answer: AD