What is the output when the main() method is executed?

public class Base {
    public void process(Base b) {
        System.out.println("Base");
    }
}

public class Derived extends Base {
    public void process(Derived d) {
        System.out.println("Derived");
    }
}

public class Main {
    public static void main(String[] args) {
        Base b = new Derived();
        b.process(b);
    }
}