A company has created a resource group, as shown below. They want to ensure that resources within the resource group don’t get accidentally deleted. 

Which of the following would you use for this purpose?

Answer options:

A.Access Control
B.Policies
C.Locks
D.Diagnostics settings

Answer – C 
The Microsoft documentation mentions the following. 

Option A is incorrect since this is used to set the permission for resources. 
Option B is incorrect since this is used for governance purposes. 
Option D is incorrect since this is used to enable diagnostics on the underlying resource. 
For more information on Azure locks, please visit the below URL- 

https://docs.microsoft.com/en-us/azure/azure-resource-manager/resource-group-lock-resources