If the registry key already exists, what happens when you run reg add?

• A. The key becomes read-only
• B. The value is kept unchanged
• C. The information will be overwritten
• D. It prompts for confirmation

Answer: (C)

Reg add updates or creates registry values. If the target key exists and you specify a value that already has data, the command writes the new data to that value, replacing the old information. In other words, the stored data is overwritten. If you want to overwrite without a prompt, include the /f flag; otherwise you may be asked to confirm the overwrite. It doesn’t make the key read-only, nor does it leave the existing data untouched.