A company is planning to host an application on a set of Virtual Machines in Azure. They want to ensure that the application recovers from a region-wide failure in Azure. Which of the following concept needs to be considered to fulfil this requirement?

Answer options:

A.Scalability
B.Disaster Recovery
C.Agility
D.Elasticity

Answer – B 
The Microsoft documentation mentions the following. 

Option A is incorrect since this is used to scale in our scale-out infrastructure. 
Option C is incorrect since this is used from a customer perspective to make applications more agile. 
Option D is incorrect since this is used to make an application more flexible in its architecture based on user demand. 
For more information on disaster recovery in Azure, please visit the below URL- 

https://docs.microsoft.com/en-us/azure/architecture/resiliency/disaster-recovery-azure-applications