You have a server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2). Server1 has a scheduled task that runs Ntbackup.exe every night. The scheduled task is configured to run by a user named BackupUser. BackupUser is a member of the local Backup Operators group. You apply a custom security template that modifies the user rights on Server1. You discover that the scheduled backup job does not work anymore. You use the Local Security Settings console to view the current user rights assignments. The relevant output from the console is shown in the exhibit. (Click the Exhibit button.) You need to ensure that the scheduled backup job executes successfully on Server1. Which user right should you assign to BackupUser?（）

• A、Allow log on locally.
• B、Log on as a service.
• C、Log on as a batch job.
• D、Act as part of the operating system.