A company wants to host a mission-critical application on a set of Virtual Machines in Azure. They want to ensure that they can set up the infrastructure in Azure to guarantee the maximum possible uptime for the application. Which of the following can you make use of in Azure to fulfil this requirement? Choose 2 answers from the options given below.

Answer options:

A.Resource Groups
B.Availability Zones
C.Availability Sets
D.Resource Tags

Answer – B and C 
The Microsoft documentation mentions the following. 

Option A is incorrect since this is used to categorize resources. 
Option D is incorrect since this is used to improve categorization and billing of resources in Azure. 
For more information on resiliency in Azure, please visit the below URL- 

https://azure.microsoft.com/en-us/features/resiliency/