The first instructor of bootstrap loader program of an operating system is stored in ____________.

The first instructor of the bootstrap loader program of an operating system is stored in BIOS(Basic Input/Output System).
The bootstrap loader is a program that resides on the EPROM, ROM, or other non-volatile memory of the machine.
It is executed by the processor automatically when the device is turned on.
To continue installing the computer's operating system, the bootstrap loader reads the boot sector of the hard drives.