Compile error because implicit downcasting.

Question

What is the result of this code ?

public class A {
        public void talk() {
            echo "Hello my name is A"
        }
    }

public class B extends A {
        public void talk() {
            echo "Hello my name is B"
        }
    }

A a = new A():
    B b = a;
    b.talk();

Accepted Answer

Compilation error because implicit downcasting.

Answer

"Hello my name is B".

Answer

Execution error because a is of dynamic type A, which does not inherit from B.

Answer

"Hello my name is A".

Question from the Object-oriented programming - Fundamentals test