Activity log offers insight into the operations/activities on every Azure resource in the subscription from the outside (the management plane) in addition to the updates on Service Health events. At which of the following layers, Activity Log is available?

Answer options:

A.Azure Resources
B.Azure Subscription
C.Azure Tenant
D.None of the above

Correct Answer: B 
Activity Log is present on the Azure Subscription layer. Activity log offers insight into the operations/activities on every Azure resource in the subscription from the outside i.e the management plane, in addition to the updates on Service Health events. Activity Log can be used to know who, what,when and who for any write operations (DELETE, POST, PUT) performed on the resources in your Azure subscription.
Option A is incorrect. These are the Resource Logs that are available at Azure Resources layer.
Option B is correct. Activity Log is present on the Azure Subscription layer.
Option C is incorrect. Azure Active Directory logs are available at the Azure Tenant layer.
Option D is incorrect. Activity Log is present on the Azure Subscription layer.
Reference: 
To know more about Azure platform logs, please visit the below-given link: 

https://docs.microsoft.com/en-us/azure/azure-monitor/essentials/platform-logs-overview