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

class Program
{
    static void Main(string[] args)
    {
        String s1 = "one";
        String s2 = string.Concat(s1 + " " + "two");
        Console.WriteLine(s2);
        Console.ReadLine();
    }
}

A. To define namespaces B. To declare variables C. To import external libraries D. To create instances of classes

A. Exits the switch statement B. Skips the current iteration C. Continues to the next iteration D. Throws an exception

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

A. To declare a constant B. To prevent a variable from changing C. To allow a variable to be changed D. To declare a static variable