Three file servers, an unmanaged switch, an unmanaged UPS (Uninterruptible Power Supply), one KVM (keyboard/video/mouse) switch, one keyboard, one monitor, and one mouse are installed in a server rack.

How many KVM (keyboard/video/mouse) cable sets are needed to connect the servers to the KVM (keyboard/video/mouse) switch?

A.
four

B.
three

C.
one

D.
two

E.
five