Refer to the exhibit.

What is needed to allow host A to ping host B?

A.
a straight-through cable connecting the switches

B.
a crossover cable connecting the switches

C.
a router connected to the switches with straight-through cables

D.
a CSU/DSU connected to the switches with straight-through cables

E.
a backbone switch connecting the switches with either fiber optic or straight-through cables

Explanation: