You work as an IT engineer in an international company which is named WINTEL. You are in charge of the network of the company. You have a Windows Small Business Server (SBS) 2003 environment installed on a server named server1 in the network. In order to meet the business requirements, you are preparing for the upgrade from the (SBS) 2003 environment to a Windows Small Business Server (SBS) 2008 environment with an additional Windows 2000 Server domain controller. So what action should you perform to prepare for the upgrade?

A.
Demote the Windows 2000 Server domain controller by using the NTDSUTIL command-line tool and raise the domain functional level on the Windows SBS 2003 server.

B.
Disconnect the operations master (FSMO) roles from the Windows 2000 Server domain controller and raise the domain functional level on the Windows SBS 2003 server.

C.
Demote the Windows 2000 Server domain controller by using the DCPROMO command-line tool and raise the domain functional level on the Windows SBS 2003 server.

D.
Transfer the operations master (FSMO) roles from the Windows 2000 Server domain controller to the Windows SBS 2003 server and raise the domain functional level on the Windows SBS 2003 server.

E.
Disconnect the Windows 2000 Server domain controller from the network, raise the domain functional level on the Windows SBS 2003 server, and then reconnect the Windows 2000 Server domain controller to the network.