In the following pseudo code, how many callback functions are used?

delegate int MyDelegate(int a, int b); class MainApp { public static void Calculator(int a, int b, MyDelegate d) { print(d(a,b)) } public static int add(int a, int b) { return a+b} public static int subtract(int a, int b) { return a-b} public static int multiply(int a, int b) { return a*b} static void Main() { MyDelegate Add = new MyDelegate(add) MyDelegate Subtract = new MyDelegate(subtract) MyDelegate Multiply = new MyDelegate(multiply) Calculator(3,4,Add) Calculator(3,4,SubTract) Calculator(3,4,Multiply) } }

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In the following pseudo code, how many callback functions are used? delegate int MyDelegate(int a, int b) class MainApp public static void Calculator (int a, int b, MyDelegate d) t int b, MyDelegate d) print(d(a,b)) public static int add(int a, int b) return a+b) public static int subtract (int a, int b) t return a-b) public static int multiply(int a, int b) t return a-b static void Main) MyDelegate Add new MyDelegate(add) MyDelegate Subtract -new MyDelegate(subtract) MyDelegate Multiply- new MyDelegate(multiply) Calculator (3,4, Add) Calculator (3,4, SubTract) Calculator (3,4,Multiply) 0 1 0 2 03 0 4