With reference to the wheelCount() method, the three classes shown above demonstrate which aspect of object-oriented programming? 1. AOP - (Aspect Oriented Programming) 2. Method overload 3. Multiple inheritance 4. Polymorphism

Barasheet 4

abstract class Vehicle {
  abstract int wheelCount();
}

class Automobile extends Vehicle {
  int wheelCount() {
    return 4;
  }
}

class Motorcyle extends Vehicle {
  int wheelCount() {
    return 2;
  }
}