【单选题】
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 user-defined stored procedures. Now you have to make sure two things, first, the names of all user-defined stored procedures must contain the prefix usp_ on all instances; second, stored procedures that do not contain this prefix cannot be created by you. <br /> So what should you do to ensure this two?（）  
A、You should create a policy that targets the name of the stored procedure that is evaluated on change.
B、You should create a policy that targets the name of the stored procedure that is evaluated on demand.
C、You should create a condition that targets the name of stored procedure that is evaluated on demand.
D、You should create a condition that targets the name of the stored procedure that isevaluated on change.
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