Which of the descriptions about the FIU board is correct?

Which of the descriptions about the FIU board is correct?
A . The FIU board processes monitoring information.
B. FIU can complete the access and solution of OSC channel.
C. In OptiX OSN 880 0 equipment, when there is no signal input, the FIU board will report an alarm.
D. Whether it is an OLA station or an OADM station, a station only needs one FIU.

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Answer: B