A company has an Azure subscription. They want to deploy a set of applications to a set of Azure virtual machines. Each application has different requirements when it comes to reliability.

Name	Requirement

testapp1

Be able to deploy the application across a set of identical virtual machines. The infrastructure should be able to meet demand automatically

testapp2

Here the infrastructure needs to be available even in the event of a data center failure

Which of the following would you recommend for testapp2?

Answer options:

A.Availability Sets
B.Availability Zones
C.Virtual Machine Scale Sets
D.Azure Traffic Manager

Answer – B 
Option A is incorrect since Availability Sets can’t protect against data center level failures. 
Option C is incorrect since this is used for scaling in and out virtual machines in your infrastructure. 
Option D is incorrect since this is a DNS routing-based service. 
For this requirement, you can make use of Availability Zones. Here you can protect your resources from an Azure Data Center failure. 
For more information on Availability Zones, one can browse to the following URL- 

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