An intranet server should generally be placed on the:

A.
internal network.

B.
firewall server.

C.
external router.

D.
primary domain controller.

Explanation:

An intranet server should be placed on the internal network. Placing it on an external router leaves
it defenseless. Since firewalls should be installed on hardened servers with minimal services
enabled, it is inappropriate to store the intranet server on the same physical device as the firewall.
Similarly, primary- domain controllers do not normally share the physical device as the intranet
server.