Explanation:

The 'booting' process, specifically the Power-On Self-Test (POST) phase, is responsible for checking the computer's hardware components (CPU, memory, keyboard, display adapter, etc.) to ensure they are present, connected correctly, and functioning properly before the operating system is loaded. If any critical component fails this check, the computer typically emits a series of beeps or displays an error message. Option (b) 'Processing' refers to the CPU executing instructions and manipulating data, which occurs *after* the system has booted. Option (c) 'Saving' is the act of writing data to a storage device. Option (d) 'Editing' involves modifying data or files. None of these other options involve the initial hardware verification that occurs when a computer starts up. Therefore, 'booting' is the correct process.