Consider the following code that use Singleton pattern to answer below questions?

public class Singleton {

private Singleton(){}

public static Singleton getInstance(){

return SingletonHelper.INSTANCE; }

private static class SingletonHelper{

private static final Singleton INSTANCE = new Singleton(); }

}

1. (2 points) Does the above code ensure to have only one instance of class Singleton? Explain your answer?

1. (1 point) Write a code to show how Class A can get an instance of Singleton class?

1. (3 points) Is the above code considered thread-safe? Explain your answer?

1. (4 points) Rewrite the above code to to make it thread-safe using the idea of synchronization?