Which of the following could cause this problem?

Computer 1 is consoles into switch A. Telnet connections and pings run from the command prompt on switch A fail. Which of the following could cause this problem?

A.
switch A does not have a cdp entry for switch B or router JAX

B.
switch A does not have an IP address

C.
port 1 on switch A should be an access port rather than a trunk port

D.
switch A is not directly connected to router JAX

E.
switch A does not have a default gateway assigned