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

static void Main(string[] args)
{
   int a = 5;
   fun1 (ref a);
   Console.WriteLine(a);
   Console.ReadLine();
}
static void fun1(ref int a)
{
    a = a * a;
}

A. A blueprint for creating objects B. A method in C# C. A variable in C# D. A data type in C#

A. create B. instance C. object D. new

A. A method in C# B. A variable in C# C. An instance of a class D. A data type in C#

A. public B. private C. protected D. internal