USE ONLY C#: Write a LINQ query that selects all the 7s in an array that contains 7, 2, 7, 5, 5, 7, 9, 1, 6, 3, 7, 7, 2, 8. Then determines how many elements are in the results. You need to write C# codes that create the array, conduct the LINQ query and count the number of elements. No GUI controls are required.