The correct answer is C. ROM BIOS.
The POST routine is a series of tests that the computer performs when it is turned on. The purpose of the POST routine is to check the hardware and make sure that it is working properly. The POST routine is stored in the ROM BIOS, which is a type of memory that is permanently stored on the motherboard. The ROM BIOS is the first thing that the computer loads when it is turned on, and it is responsible for initializing the hardware and loading the operating system.
RAM is a type of memory that is used to store data and programs that are currently being used by the computer. RAM is volatile, which means that it loses its contents when the power is turned off.
The microprocessor is the main processor in the computer. It is responsible for executing instructions and performing calculations.
CMOS is a type of memory that is used to store system configuration information, such as the date, time, and system settings. CMOS is non-volatile, which means that it retains its contents even when the power is turned off.
The 8259 POST controller is a chip that is responsible for controlling the POST routine. It sends signals to the various components of the computer to test them and reports the results of the tests to the microprocessor.