You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.  You create a custom Web user control named SharedControl. The control will be compiled as a library.  You write the following code segment for the SharedControl control. （Line numbers are included for  reference only.）  01 protected override void OnInit（EventArgs e） 02 {  03 base.OnInit（e）；  04  05 }  All the master pages in the ASP.NET application contain the following directive.  <%@ Master Language="C#" EnableViewState="false" %>  You need to ensure that the state of the SharedControl control can persist on the pages that reference a  | English | Chinese | Japan | Korean | - 87 - Test Information Co.， Ltd. All rights reserved. master page.  Which code segment should you insert at line 04？（）

• A、Page.RegisterRequiresPostBack（this）；
• B、Page.RegisterRequiresControlState（this）；
• C、Page.UnregisterRequiresControlState（this）；
• D、Page.RegisterStartupScript（"SharedControl"，"server"）；