You're tasked with exporting a specific registry key and its subkeys to a file for backup purposes. Which command-line utility should you use?1.0 Marksregbackupregsavereg.exeregexportregedit.exe

You should use the "regedit.exe" command-line utility. Here are the steps:

1. Open the command prompt: Press the Windows key + R, type "cmd" in the Run box, and press Enter.

2. In the command prompt, type "regedit" and press Enter. This will open the Registry Editor.

3. In the Registry Editor, navigate to the registry key you want to export.

4. Right-click on the key and select "Export".

5. In the Export Registry File dialog box, select a location to save the backup file, give it a name, and click "Save".

This will create a .reg file that contains the registry key and its subkeys. You can use this file to restore the registry key if needed.