S7700 and S9700 switches are Huawei’s modular campus switches. Compared with the S7700, what advantages does the S9700 have?

S7700 and S9700 switches are Huawei’s modular campus switches. Compared with the S7700, what advantages does the S9700 have?
A . The S9700 provides more slots and interfaces.
B . The S9700 supports non-blocking dab switching.
C . The S9700 support the redundancy design for engines, power modules, and fans.
D . The S9700 provides dab center features such as Transparent Interconnection of Lots of Links (TRILL) and Fibre Channel over Ethernet (FCoE).

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Answer: B