【单选题】
You are creating an ASP.NET Web site. <br /> The site has a master page named Custom.master. <br /> The code-behind file for Custom.master contains the following code segment. <img src="https://nimg.ppkao.com/2018-07/lina/201807261357401768.jpg?sign=dfd5f2dbc855dd920a1fc26bf0a5f8f8&t=62d27db1" /> <br /> You create a new ASP.NET page and specify Custom.master as its master page. You add a Label control named lblRegion to the new page. <br /> You need to display the value of the master page’s Region property in lblRegion. What should you do？ （）
A、Add the following code segment to the Page_Load method of the page code-behind file. CustomMaster custom = this.Parent as CustomMaster； lblRegion.Text = custom.Region；
B、Add the following code segment to the Page_Load method of the page code-behind file. CustomMaster custom = this.Master as CustomMaster； lblRegion.Text = custom.Region；
C、Add the following code segment to the Page_Load method of the Custom.Master.cs code-behind file. Label lblRegion = Page.FindControl（"lblRegion"） as Label； lblRegion.Text = this.Region；
D、Add the following code segment to the Page_Load method of the Custom.Master.cs code-behind file. Label lblRegion = Master.FindControl（"lblRegion"） as Label； lblRegion.Text = this.Region；
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