What is the role of the Node structure within the LList class?

• A. It defines the structure of each node, including data and pointers to previous and next nodes
• B. It stores the entire list as an array
• C. It manages memory for the list
• D. It tracks how many nodes are in the list

Answer: (A)

In a linked list, the Node is the building block that defines what each element contains and how elements connect to one another. Each Node holds the actual data value and the references to its neighbors—previous and next in a doubly linked list (or just next in a singly linked list). The LList is built by linking these Nodes together through those pointers, so you can traverse from one node to the next, insert new nodes, or remove them by updating the relevant pointers. The list as a whole isn’t stored in a single array; instead, it’s a chain of Node objects connected by their links, with the list maintaining a reference to the starting node (and sometimes the ending node). Memory management and counting the number of nodes are handled by other parts of the LList implementation, not by the Node itself. So, the Node’s role is to define the structure of each node, including data and pointers to and from neighboring nodes.