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

static void Main(string[] args)
{
    String obj = "hello";
    String obj1 = "world";   
    String obj2 = obj;
    string s = obj+" "+obj1;
    Console.WriteLine(s.IndexOf('r'));
    Console.ReadLine();
}

What is the correct way to declare a string array in C#?

A. string[] colors;

B. array colors;

C. string colors[];

D. colors[] = string;

How do you access the first element of an array named 'numbers' in C#?

A. first(numbers);

B. numbers.first;

C. numbers(1);

D. numbers[0];

What is the correct way to initialize an array of integers with values {1, 2, 3} in C#?

A. int[] numbers = new int[] {1, 2, 3};

B. int numbers[] = {1, 2, 3};

C. int[] numbers = {1, 2, 3};

D. numbers[] = {1, 2, 3};

Which of the following statements is true regarding arrays in C#?

A. Arrays in C# can dynamically resize

B. The length of an array cannot be changed

C. Arrays in C# can only store primitive types

D. None of the above