Which term is used to describe a network security device or host software that filters communications, usually network traffic, based on a set of predefined rules? a. snifferb. auditorc. hackerd. firewall

The correct answer is option (D).

Explanation:

According to the scenario, the most appropriate answer is option (D) because the firewall can be defined as the software program which checks through the network for incoming and outgoing communication on predefined rules.

while the other options are wrong because of the following reasons :

we need a link or picture : )

that without the operating systems you would have to control and synchronize computer hardware.