You are reviewing a C# program that contains the following class: public class Rectangle { public double Length {get; set;} public double Width { get; set; } } The program executes the following…

You are reviewing a C# program that contains the following class:

public class Rectangle { public double Length {get; set;} public double Width { get; set; } } The program executes the following code as part of the Main method:

Rectangle r1, r2; r1 = new Rectangle { Length = 10.0, Width = 20.0 }; r2 = r1; r2.Length = 30; Console.WriteLine(r1.Length); What will be the output when this code is executed?