(A) Promotion, callout, and sitelink extensions
(B) Sitelink, location, and call extensions
(C) Sitelink, callout, and structured snippets
(D) Message, callout, and structured snippets
The ad extensions that can serve automatically are the universal extensions Callout extensions, Sitelink extensions, and Structured snippets.
Google Ads will serve dynamic ad extensions if it believes this will have positive impact on the performance or when you manually don’t create ad extensions.
This question is a part of the Google Ads Search Certification Knowledge Check Assessment and the Check Your knowledge section of the Make ads relevant with Search Ad Extensions unit. You can find all the answers to both exams in our Google Ads Search Certification Knowledge Check Assessment Answers page, and Make ads relevant with Search Ad Extensions Answers page.