Which method does following C# code explains?

static void Main(string[] args)
{
    int a = 10, b = 20;
    method(ref a,  ref b);
    console.writeline(a + "  " + b);
}
static void swap(ref int i,  ref int j)
{  
    int t;
    t = i;
    i = j;
    j = t;
}

A. string[] colors; B. array colors; C. string colors[]; D. colors[] = string;

A. first(numbers); B. numbers.first; C. numbers(1); D. numbers[0];

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};

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