Mark works as a Security Administrator for uCertify Inc.

Mark works as a Security Administrator for uCertify Inc. For the last few days, he is getting an error message, i.e., 'Remove the Boot.ini file because it is harmful for operating system'. When Mark reads about the Boot.ini file, he finds that it is a system file that is used to load the operating system on a computer. Which of the following types of virus has attacked Mark's computer?