Where is the BIOS located?

RAM is volatile memory that loses its contents when power is removed, making it unsuitable for storing firmware like the BIOS that must persist between power cycles.

The hard drive is a secondary storage device that is initialized by the BIOS during boot; the BIOS itself cannot reside there because the drive is not accessible before the BIOS runs.

The BIOS is firmware stored in a non-volatile ROM or flash memory chip that is soldered directly onto the computer's motherboard. It is the first code executed when a computer powers on, performing hardware initialization (POST) and loading the bootloader. Because it must persist without power and be available before any OS or drives are active, it resides on the motherboard itself.

An LCD monitor is a display output device with no role in storing or executing system firmware such as the BIOS.