A company wants to start using Azure. They want to use availability zones in Azure. Which of the following is attached to the concept of availability zones in Azure?

Answer options:

A.Region failure
B.Resource failure
C.Data Center failure
D.Azure failure

Answer – C 
The Microsoft documentation mentions the following. 

Since this is clearly mentioned in the Microsoft documentation, all other options are incorrect. 
For more information on availability zones, please visit the below URL- 

https://docs.microsoft.com/en-us/azure/availability-zones/az-overview