You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You create a class named Person that has a FirstName property and a LastName property. You create a resource that contains a collection of Person objects and assign the family key to it. You add a ListBox control by using the following code fragment. (Line numbers are included for reference only.) You need to ensure that each item in the ListBox control meets the following requirements: Contains a TextBox that is data-bound to the FirstName property. Contains a TextBox that is data-bound to the LastName property. Which code fragment should you insert at line 04?（）

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