A company wants to migrate its current on-premises servers to Azure. They want to ensure that the servers are running even if a single Azure Data Center goes down. Which of the following terms refers to the solution that needs to be in place to fulfill this requirement?

Answer options:

A.Fault tolerance
B.Elasticity
C.Scalability
D.Low Latency

Answer – A 
This concept of Fault tolerance refers to achieving high availability on the cloud. 

Options B and C are incorrect since this refers to how best you can scale up or down based on demand. 
Option D is incorrect since this refers to data transfer. 
For more information on resiliency in Azure, please visit the below URL- 

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