Which of the following options correctly defines a firewall (in the context of computing)?

It is the name of a software. It is a hardware device. It is a combination of both, software and hardware devices to permit or deny network transmission based on a set of rules. It is a combination of software and hardware-based devices to permit any and every network transmission.

It is a combination of both, software and hardware devices to permit or deny network transmission based on a set of rules.