A company is planning to host a set of resources in its Azure subscription. They are currently aware that most Azure Service can provide an SLA of 99.9%. Which of the following techniques could be used to increase the uptime for resources hosted in Azure?

Answer options:

A.Adding resources to multiple regions
B.Adding resources to the same data center
C.Adding resources to the same resource group
D.Adding resources to the same subscription

Answer – A 
By having an additional region for your resources, you have more options if the primary regions go down for any reason. This can increase the availability of your entire application and hence give a better uptime on the SLA. 
An example architecture of a highly available architecture for a web application is shown below. 
This is from the Microsoft documentation. 

All other options are invalid because the best-case scenario is to split resources across different availability zones or regions. 
For more information on an example of high availability for your application, please visit the below URL- 

https://docs.microsoft.com/en-us/azure/architecture/reference-architectures/app-service-web-app/multi-region