What is the purpose of a POST (Power-On Self-Test)?

Correct answer: Verify hardware components are functioning correctly during boot

The Power-On Self-Test (POST) is a firmware-level diagnostic routine executed by the BIOS or UEFI immediately when a computer is powered on, checking that critical hardware components such as CPU, RAM, and storage are present and functioning before handing control to the operating system. Option A, configuring network settings, is handled by the operating system or network configuration utilities, not by POST, which runs before the OS loads. Option B, encrypting sensitive data, is a function of security software or hardware encryption modules and is completely unrelated to the POST diagnostic process. Option D, installing device drivers, is an operating system function that occurs after the OS has booted, well after POST has completed.