Suppose a router has n input ports each with identical line speeds, n output ports each with identical line speeds, and the line speed of an output port is at least n times as that of an input port. Further suppose that the switching fabric speed is at least n times as fast as an input line speed. Then

Question $3$ options:

A$)$

queuing can occur in an output port

B$)$

queuing can occur in the switching fabric

C$)$

there is no queuing delay in the router

D$)$

queuing can occur in an input port