How To Create a Custom Boolean Field That Answers Whether ADDS Present

[Renae_03]

Client is requesting a custom field that is boolean reflecting whether a device on network is currently running Active Directory. I realize ServiceNow already tracks this via "Installed Software" or "Running Processes" 

My thought is to create a WMI probe with a script that returns true if ADDS is present. I also see that there is a possibility of adding "On Classification Script" that could possibly do the same thing and may be simpler once a windows device has been classified. However, I am unsure of how this would be able to feed into the custom attribute or if I can use the existing information in Installed Software or Running Processes. 

Any help would be appreciated. 

[Renae_03]

Created the custom attribute (pictured below)  now I just need help with developing the logic for how the attribute will show true or false 

[SagaS]

Choose a programming language: Select a programming language that you are comfortable with and that supports working with Active Directory. Common languages for this purpose include C PowerShell, and Python.

[Pratiksha]

Do you have it on running process or installed software?