Refer to the exhibit. This display has been truncated to remove information that is not relevant to the question. What would be a reason that there have been 21 ignored packets?

A.
Ethernet0 has no CDP neighbors.

B.
There are no free input buffers to accept new packets.

C.
There are no free output buffers for packets, which are traversing the router, to go into for transmission.

D.
Ethernet0 and the neighbor that it is connected to are not running the same routing protocol.

E.
This is not a valid error display. The display has been modified to show that there have been ignored packets.