(A) DMOS
(B) CMOS
(C) RAM
(D) All of these
🧠 Explanation:
When a computer is turned ON, the BIOS runs a program called **POST (Power-On Self Test)**. This program checks and verifies the functionality of essential hardware components like memory, keyboard, storage devices, and other peripherals. POST ensures that all critical parts are working properly before the operating system loads. If any hardware issues are detected, POST alerts the user through beep codes or error messages. This initial testing process is vital for identifying problems early and ensuring the computer operates smoothly and reliably.
