Final Answer:
Rootkit is solely designed to avoid detection by an antivirus program by using the underlying operating system to its advantage. Thus the correct option is A.
Step-by-step explanation:
Rootkits are specifically designed to evade detection by antivirus programs by leveraging the underlying operating system's functionality. These malicious software packages aim to gain root access or privileged control over a system while remaining hidden from security software scans. By altering system functions or intercepting system calls, rootkits cloak their presence, making them challenging to detect.
They can manipulate system components, modify data structures, or even replace core system files to maintain their stealthy operation. Rootkits are adept at exploiting vulnerabilities in the operating system, enabling them to persistently hide their existence, making them a potent tool for attackers seeking covert access and control.Thus the correct option is A.