The following description of the electrical layer overhead-source function, the correct ones are: (Multiple Choice)

The following description of the electrical layer overhead-source function, the correct ones are: (Multiple Choice)
A . OPUk performs client signal mapping, rate adjustment and rate adaptation in the transmission direction.
B . ODUkP is responsible for calculating BIP-8, writing PM, GCC1/2 and other overheads.
C . ODUkT calculates BIP-8 and writes to TCHi.
D . OTUk is responsible for calculating BIP-8, writing to SM, GCCO, FAS, MAFS, etc.

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Answer: ABCD