Multiple networked devices running on the same physical hardware that provide central access to
applications and files, where each device runs as a piece of software are known as:

A.
Virtual desktops.

B.
Switches.

C.
PBXs.

D.
Virtual servers.

Explanation:
A Virtual server, usually a Web server, that shares computer resources with other
virtual servers. In this context, the virtual part simply means that it is not a dedicated server — that
is, the entire computer is not dedicated to running the server software