We can overload methods with differences only in their return type. (True/False)

Members of a class specified as private are accessible only to the methods of the class. (True/False)

A static class method can be invoked by simply using the name of the method alone. (True/False)

Which of the following function-definitions are overloading the method given below :

int sum(int x, int y) {}

1. int sum(int x, int y, int z) { }
2. float sum(int x, int y) { }
3. int sum (float x, float y) { }
4. int sum (int a, int b) { }
5. float sum(int x, int y, float z) { }