What will be the output of the following C# code?

static void Main(string[] args)
{
    string s1 = "Delhi";
    string s2;
    s2 = s1.Insert (6, "Jaipur");
    Console.WriteLine(s2);
}

A. int B. string C. double D. character

A. ; B. : C. . D. ,

A. num = int; B. var num; C. num int; D. int num;

A. Declares a constant B. Converts a variable to string C. Implicitly declares a variable D. Defines a method