Concept:Antivirus software is a program designed to prevent, detect, and remove harmful software from a computer system.
Explanation:McAfee and Avast are both widely used security tools that protect computers from viruses and other malicious programs.
They work by scanning files, blocking suspicious websites, and removing detected threats such as viruses and spyware.
Because they fall under the category of protective security applications, they are correctly classified as antivirus software.
Other common examples include Quick Heal and Norton.
Library software, such as CodeAchi or Libero, is meant for managing library functions like cataloguing and issuing books, so option A is incorrect.
"Antisecurity" and "Library Ware" are not valid software categories, so options B and C are also incorrect.
Answer:Option D — Antivirus.