Final answer:
To verify if all drivers on Windows 10 machines are signed, use the Sigverif.exe tool in the Command Prompt.
Step-by-step explanation:
To verify that all drivers installed on Windows 10 machines are signed drivers, you can use the Sigverif.exe tool.
To run the Sigverif.exe tool, open a command prompt by pressing Windows key + X and selecting Command Prompt (Admin). Then, type 'sigverif' and press Enter.
The tool will perform a scan of all installed drivers and generate a report indicating whether the drivers are signed or not. You can then review the report to verify which drivers are signed and which are not.