What will be printed out as a result of the following code execution?
 
namespace ConsoleApplication1 
{ 
     class Program 
     {
          static void Main(string[] args)
          { 
               Console.WriteLine(Test.Foo().ToString()); 

                Console.ReadLine();
           } 
       } 

       class Test 
      { 
           public static int Foo() 
           { 
                return null; 
            } 
        } 
   }
 

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