What type of model-driven app Dataverse search is utilizing Azure Search service?

Answer options:

A.Quick Find
B.Advanced Find
C.Relevance Search
D.Categorized Search

Correct Answer: C 
Dataverse provides several types of searches for model-driven apps: Quick Find — provides data search for every table by defined columns
Advanced Find — creates more complex search queries
Categorized Search — searches across ten tables using the defined columns in Quick Find
Relevance Search — searches across multiple tables and their columns by utilizing the Azure Search service.
Relevance Search is a powerful service. It is very fast and produces accurate results. The search can search across the tables and the documents stored in Dataverse, like pdf, office documents, HTML, zip, and others. 
By default, this type of search is disabled. To use Relevance Search, you need to enable it in the Power Apps admin center: Environments/Settings/Features. 

All other options are incorrect. 
For more information about Dataverse search services, please visit the below URLs: 

https://docs.microsoft.com/en-us/powerapps/user/search
https://docs.microsoft.com/en-us/powerapps/user/relevance-search
https://jukkaniiranen.com/2020/11/make-your-power-apps-search-experience-more-relevant/