Which of the following are correct about NE8000 X4 and X 8 redundancy design?

Which of the following are correct about NE8000 X4 and X 8 redundancy design?
A . MPU 1+1 backup
B . SFU 7+1 backup
C . Power supply 9+1 backup
D . PEM 1+1 backup

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Answer: AB