Which method does following set of 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. Call by reference
• B. Call by value
• C. Output parameter
• D. Parameter arrays