1) What is Encapsulation and Polymorphism 2) Difference between Abstraction and Interface 3) Difference between IQueryable and IEnumerable 4) Explain Extension Methods, Anonymous method, Middleware 5) Write a C# program for reversing of the Whole String. 6) Write a C# program to print index of Array from given Array Of Numbers [2, 7, 11, 15] whose Sum is 9.