Answer below questions about the Singleton:

$(2$ points$)$ One of the limitations of Singleton is sub classing any class can subclass the Singleton class and thus have access to its own instance because of inheritance sub class inherit the parent class, what do you think of this?

Consider the following code to answer the following question:

public class PrintDriver $\{$

private static final PrintDriver INSTANCE $=$ new PrintDriver$()$;

private PrintDriver$()\{\}$

public static PrintDriver getInstance$()\{$ return INSTANCE; $\}$

$\}$

which type of initialization is used in the code? What is issue of this type of initialization?

Is the singleton in the above code thread$-$safe? Explain your answer?

Rewrite the code to make it thread$-$safe using double$-$check locking?