You work in a company which is named Wiikigo Corp. The company uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. According to the company requirement, the names of all user-defined stored procedures must contain the prefix usp_ on all instances. Besides this, you must make sure that stored procedures that do not contain this prefix cannot be created by you. What should you do?（）  

• A、A policy should be created. The policy targets the name of the stored procedure that is evaluated on demand. 
• B、A policy should be created. The policy targets the name of the stored procedure that is evaluated on change. 
• C、A condition should be created. The condition targets the name of the stored procedure that is evaluated on change 
• D、A condition should be created. The condition targets the name of stored procedure that is evaluated on demand.