You have a single Active Directory Domain Services (AD DS) forest. The forest has Exchange Server 2003 installed in the domains as shown in the following table.

You are transitioning from an Exchange Server 2003 environment to an Exchange Server 2007 environment.
You need to ensure that the Recipient Update Service functions properly after you update the AD DS schema for Exchange 2007. You need to achieve this goal with the least amount of impact to your environment.
What should you do?

A.
Run the setup /PrepareLegacyExchangePermissions command.

B.
Run the setup /PrepareSchema command.

C.
Run the setup /PrepareAD command.

D.
Run the setup /PrepareLegacyExchangePermissions:contoso.com command.