Consider the following Java code snippet:

class Animal {
}

class Dog extends Animal {
}

class Cat extends Animal {
}

public class Test {
    public static void main(String[] args) {
        Animal a = new Dog();
        /* Missing Statements ? */
    }
}

Which two of the following statements, inserted independently, could legally be inserted into the missing section of this code?

1. boolean isDog = (a instanceof Dog);
2. boolean isCat = (a instanceof Cat);
3. boolean isAnimal = (a instanceof Animal);
4. boolean isDog = (Dog instanceof a);

Choose the correct answer from the options given below: