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";