You are the network administrator for a company named contoso. Your network consists of two Active Directory domains. The network contains the servers show in the following table.

You add a user named User1 to the local Administrators group of Server4. You assign User1 the Exchange Full Administrator role.

User1 attempts to install Exchange Server 2003 on Server4, The installation fails.

You need to ensure that User1 can install Exchange Server 2003 on Server4.

What should you do?

A.
Run Setup /Domainprep on Server4.

B.
Upgrade Server3 to Windows Server 2003.

C.
Upgrade Server4 to Windows Server 2003.

D.
Configure Server3 as a global catalog server.