Consider the following implementation of a Singleton class using lazy initialization with double$-$check locking in Java. Identify which option In the Decorator Design Pattern, an abstract class or interface defines the structure for components and decorators. Consider a Java$-$like implementation where decorators add or enhance functionalities of components.

What is the role of the decorate$()$ method within the ConcreteDecorator class?

Pseudo$-$code:

interface Component $\{$

void operation$()$;

$\}$

class ConcreteComponent implements Component $\{$

public void operation$()\{$

$\}$

$\}$

abstract class Decorator implements Component $\{$

protected Component component;

public Decorator$($Component component$)\{$

this.component $=$ component;

$\}$

public void operation$()\{$

component.operation$()$;

$\}$

$\}$

class ConcreteDecorator extends Decorator $\{$

public ConcreteDecorator$($Component component$)\{$

super$($component$)$;

$\}$

public void operation$()\{$

super.operation$()$;

decorate$()$;

$\}$

private void decorate$()\{$

$\}$

$\}$

To initialize the component properties within the decorator.

To execute the original operation$()$ method of the component without changes.

To add or enhance the functionality of the component after its original operation$()$ method is called.

To replace the operation$()$ method of the component with a new one.The implementation is incorrect because the instance variable should be declared as volatile to prevent issues with instance initialization due to Java memory model optimization.

The implementation fails because it does not check if instance is null within the synchronized block, which can lead to the creation of multiple instances if multiple threads enter the synchronized block simultaneously.

This implementation is incorrect because it uses excessive synchronization; the synchronized block should be placed outside the outer if statement to ensure thread safety.

This implementation is correct as it ensures that instance is only initialized once and uses double$-$check locking to prevent multiple threads from creating multiple instances.