单选题When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the interface clock rate determined?（）AIt is supplied by the CSU/DSU.BIt is supplied by the far end router.CIt is determined by the clock rate command.DIt is supplied by the Layer 1 bit stream timing.
单选题
When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the interface clock rate determined?（）
A
It is supplied by the CSU/DSU.
B
It is supplied by the far end router.
C
It is determined by the clock rate command.
D
It is supplied by the Layer 1 bit stream timing.
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