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. 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"）；