You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You create a custom-templated server control. You need to ensure that the child controls of the server control are uniquely identified within the control hierarchy of the page. Which interface should you implement？（）

A. the ITemplatable interface
B. the INamingContainer interface
C. the IRequiresSessionState interface
D. the IPostBackDataHandler interface