Huawei’s S7700 series switches support PoE boards to power PD devices, and also support PoE power redundancy. Which type as the following of the PoE power redundancy are supported by the S7712 switch? (Multiple Choice)

Huawei’s S7700 series switches support PoE boards to power PD devices, and also support PoE power redundancy. Which type as the following of the PoE power redundancy are supported by the S7712 switch? (Multiple Choice)
A . 1+1
B . 2+2
C . 1+2
D . 3+1

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Answer: BD