You are the network administrator for TestKing.com. The network consists of a single Active Directory domain named testking.com. The domain contains Windows Server 2003 computers and Windows XP Professional computers. You use a non-administrative user account named Joseph to log on to a client computer. You need to change the password for a domain user account named Sophia. You open the Active Directory Users and Computers console. When you attempt to change Sophia's password, you receive the following error message: "Access is denied". You need to remain logged on to the client computer as Joseph, and you need to be able to change Sophia's password. What should you do?（）

Add the non-administrative domain user account to the local Administrators group.
B. Use the runas command to run Active Directory Users and Computers with domain administrative credentials.
C. From a command prompt, run the net user Sophia /add /passwordreq:yes command.
D. From a command prompt, run the net accounts /uniquepw: /domain command.