You need to configure all members of an organizational unit (OU) named Research to use ABCResearch.com as their primary SMTP address

You work as a Messaging Administrator at ABC.com. The ABC.com network consists of an Active
Directory Domain Services (AD DS) domain named ABC.com. All servers run Windows Server
2012 and all client computers run Windows 8 Pro.
The company’s Exchange Server 2013 infrastructure contains an organization named ABC.com.
All ABC.com users use ABC.com as their SMTP address.
The company wants to use a separate SMTP address for their research department. The
company purchases the domain ABCResearch.com.

You need to configure all members of an organizational unit (OU) named Research to use
ABCResearch.com as their primary SMTP address.
You configure an accepted domain for ABCResearch.com in the Exchange organization.
What should you do next?

A.
Add theABCResearch.com domain to the default email address policy.

B.
Configure a new Receive Connector for theABCResearch.com domain.

C.
Modify the permissions on the default email address policy.

D.
Create a new email address policy and configure the permissions to assign the policy to the
Research OU.

Explanation: