28. Which is the BEST answer that explains the importance of antivirus? A. It protects computer from viruses, spyware, malware, Trojans, as well as any other cyber threats. B. It is specifically designed to disrupt, damage, or gain unauthorized access to a computer system. C. It is software program loaded onto a user's computer without the user's knowledge and performs malicious actions. D. It enables a user to obtain covert information about another's computer activities by transmitting data covertly from their hard drive.​