The purpose of a developer or authentication token is to track:

fforts. 

The purpose of a developer or authentication token is to track:

• Google Ads applications.
• Application Programming Interface (API) access by application.
• Google Ads usage.
• Application Programming Interface (API) usage.

Correct Answer is:

• Application Programming Interface (API) usage.

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https://support.google.com/Google Ads/answer/2375503?hl=en