Java **Question:** What is the contents of the chain referenced by firstNode?**Options:**- ◯ none of these is correct- ◯ 2 → 7 → 3- ◯ a NullPointerException will be thrown- ◯ 2 → 3 → 5- ◯ 2 → 7 → 3 → 5- ◯ 2 → 7 → 5- ◯ 7 → 3 → 5 ```javaNode a = new Node(5);Node b = new Node(3, a);Node c = new Node(7, b);Node d = new Node(2, c);Node firstNode = d;firstNode.next.next = firstNode.next.next.next;```### Explanation:This code snippet appears to be creating a linked list using a `Node` class. Here's a step-by-step explanation:1. **Node Creation:** - `Node a = new Node(5);`: Creates a node `a` with a value of 5. - `Node b = new Node(3, a);`: Creates a node `b` with a value of 3 and sets its `next` reference to node `a`. - `Node c = new Node(7, b);`: Creates a node `c` with a value of 7 and sets its `next` reference to node `b`. - `Node d = new Node(2, c);`: Creates a node `d` with a value of 2 and sets its `next` reference to node `c`. - `Node firstNode = d;`: Initializes `firstNode` to point to node `d`, making it the head of the linked list.2. **Linked List Modification:** - `firstNode.next.next = firstNode.next.next.next;`: This line modifies the linked list by changing `c`'s `next` reference. Originally pointing to `b`, it gets updated to point to `a`.### Resulting Linked List Structure:- The original sequence is `d` -> `c` -> `b` -> `a`.- After modification, the sequence becomes `d` -> `c` -> `a`.### Diagram:- **Original Structure:** ``` d (2) -> c (7) -> b (3) -> a (5) ```- **Modified Structure:** ``` d (2) -> c (7) -> a (5) ```This demonstrates a basic manipulation of a singly linked list in Java.

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Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

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Step 1 Linked Lists in Java and Assumption

JAVA linked lists are just dynamic arrays which have 2 data members associated with each node, one is data value and other is next which points to the next Node in the linked list.

So unlike the contiguous arrays, which can not insert anything in between, linked list can insert or delete any element from virtually any position in the linked lists.

Here as you have not provided with the Node() constructor details, I am just gonna assume that it takes either one or two argument, one is value of the node to be added and the other is next Node.

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