The correct option is: a. Antivirus
Explanation:
1. Antivirus programs are designed to identify and remove malware from a computer system.
2. They work by scanning files and programs on the computer for known patterns of malicious code.
3. Once malware is detected, the antivirus software takes action to either quarantine or remove the threat.
4. Examples of popular antivirus programs include Norton, McAfee, and Avast.
In this case, the option "a. Antivirus" is the set of programs that specifically focus on identifying and removing malware.