What should you do?

You are a system administrator for an organization with a Microsoft Dynamics 365 deployment (hosted in a European data center) and Active Directory Federated Services on-premises. Your organization acquires a new company in the US that is using Microsoft Dynamics 365 Online in its own tenant

The US company can continue to use their Microsoft Dynamics 365 Online instance as is. All users need to be on the European Active Directory, but they need to use an instance close to them.

What should you do?
A . Migrate the US instance to the European tenant, and set the instance the US region.
B . Keep the US tenant and federate Active Directory with both the US and European teanants.
C . Keep the US tenant, and federate Active Directory with only the European tenant.
D . Migrate the US instance to the European tenant, and set the instance to the European region.

Answer: A