The correct answer is A. Bootstrap.
The bootstrap is a small program that is stored in the BIOS (Basic Input/Output System) chip on the motherboard. When you turn on your computer, the BIOS is the first program that runs. The BIOS initializes the hardware and then loads the bootstrap program from the boot device. The bootstrap program then loads the operating system from the boot device.
The power-on self test (POST) is a series of tests that the BIOS runs to check the hardware. The POST is usually displayed on the monitor as a series of codes or messages. If the POST detects any problems, it will usually display an error message and the computer will not boot.
The system configuration is the set of settings that control how the computer works. The system configuration is usually stored in the CMOS (Complementary Metal Oxide Semiconductor) chip on the motherboard. The system configuration can be changed by using the BIOS setup utility.
The kernel loading is the process of loading the kernel into memory. The kernel is the main program of the operating system. The kernel is responsible for managing the hardware and providing services to the other programs in the operating system.
I hope this helps!