Firewall rule is an example of what?

Correct answer: Software security configuration

The direct answer is option A, software security configuration. A firewall monitors network traffic entering or leaving a computer or network. Firewall rules specify which connections or types of traffic may be allowed and which must be blocked. These rules are settings or configuration instructions implemented by firewall software or a firewall device, so option A is the correct classification. Option B, a monitor screw, is a physical hardware part and has nothing to do with deciding network access. Option C, printer ink, is a consumable physical material used for printing and does not control network traffic. Option D, a mouse wheel, is a physical input component used for scrolling, not a security rule. A rule itself is not a screw, ink or wheel; it is a logical instruction that controls communication. Although some firewalls are built into hardware, the wording “firewall rule” refers to the security configuration or policy, not to a physical part. Exam cue: allow, deny, block, permit and network traffic are strong clues for firewall configuration.