Which of the following descriptions about the Optix OSN 9800 subrack are correct?
Select all that apply, then click Submit answer.
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When the OSN 9800 P18 is used as the slave subrack, the IU18 slot can only be inserted into the service board
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When the OSN 9800 universal platform subrack is used as the slave subrack, the main control board must be placed
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In the OSN 9800 U32 subrack, IU70 is the active CTU and IU78 is the standby CTU
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The OSN 9800 U16 subrack has a total of 16 service slots, these slots have the same capacity, and the maximum support single slot 400bit/s ODUK crossover