Regarding the description of CloudEngineS8700 switch master control, the incorrect one is ()

Regarding the description of CloudEngineS8700 switch master control, the incorrect one is ()
A . The main control boards of frame 04, frame 06 and frame 10 cannot be shared.
B . The main control does not provide service ports
C . Main control and switching are integrated, centralized architecture, lower switching delay
D . 1:1 active and standby in the frame, packet loss during active and standby switching <5ms

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Answer: B