What are two possible techniques to segment Azure for the departments?

Your company plans to migrate to Azure. The company has several departments. All the Azure resources used by each department will be managed by a department administrator.

You need to recommend an Azure deployment that provides the ability to segment Azure for the departments.

What are two possible techniques to segment Azure for the departments? Each correct answer presents a complete solution. NOTE: Each correct selection is worth one point.
A . multiple subscriptions
B . multiple Azure Active Directory (Azure AD) directories
C . multiple regions
D . multiple resource groups

Answer: A,D