The following classes are defined in a program: class Person { public void speak() { System.out.println("Person:: speak() called"); } } class Nick extends Person { public void speak() { System.out.println("Nick::speak() called"); } } What will be displayed when the following code is executed? Person p = new Nick(); p.speak(); Person::speak() called None of the answers are correct O Person::speak() called Nick::speak() called Nick::speak() called O Nick::speak() called Person::speak() called