Explanation:
Rootkit virus is one type of virus which is hidden about its existence and tries to affect the maximum number of system.
Password method: This is a graphical method to identify the text hidden in the signature and confirming that it is not a robot or any other system to protect the system from hacking. This would be really hard-to-read and thus ensures safety.
Antivirus software: This is a system to protect the system, when the virus tries to attack the system. An indication will be given through the software to the user.
