Answer:
Boot loader level rootkit
Explanation:
A rootkit is a malicious program which is used by hackers to gain illegal access to the computer system.A bootloader level rootkit also known as bootkit, infects the master boot record(MBR) of the hard drive.As a result bootloader level rootkit is able to compromise the boot process and can modify the boot sequence of the machine to load themselves instead of the original virtual machine monitor or operating system.