You work in a company which uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. There are queries that have an estimated execution cost less than 3. You intend to configure the instance, make it use a single thread for these queries. In the options below, which sp_configure configuration option should you set?（）

A. DROP LOGIN "WIIKIGO\User1"; 
B. EXEC dbo.sp_droprolemember 'db_owner', 'WIIKIGO\User1';
C. EXEC dbo.sp_revokedbaccess 'WIIKIGO\User1';EXEC dbo.sp_revokelogin 'WIIKIGO\User1'; 
D. CREATE LOGIN "WIIKIGO\User1" FROM Windows;DENY CONNECT SQL TO "WIIKIGO\User1";

A.You should execute the GRANT SELECT ON dbo.Table01 TO User1 Transact-SQL statement. 
B.You should execute the GRANT EXECUTE ON dbo.Procedure1 TO User1 Transact-SQL statement. 
C.You should alter Procedure01 and add the WITH EXECUTE AS OWNER option to its header 
D.You should alter Procedure01 and add the EXECUTE AS USER = 'dbo' option immediately before the call to the sp_executesql stored procedure.

A.You should check SQL1.log
B.You should check SQLAGENT.OUT
C.You should check log_xx.trc
D.You should check ERRORLOG