Your network consists of a single Active Directory domain. All client computers are members of the domain and run Windows XP Professional Service Pack 3 (SP3). A user attempts to log on to her portable computer and receives the following error message. You need to ensure that the user can log on to the computer by using her domain account. What should you do?（）

• A、Instruct the user to restart her computer.
• B、On a domain controller, run Net time /set /y.
• C、On a domain controller, reset the portable computer’s computer account.
• D、On a domain controller, force replication between all domain controllers.