Which components are typically included in a standard linkedListType class?

• A. Pointers to the head and tail nodes and a count of nodes
• B. A single pointer to the head node
• C. A pointer to the current node
• D. A sentinel node pointer

Answer: (A)

A robust linked list class typically keeps track of where the list starts, where it ends, and how many elements it contains. Having a pointer to the head allows you to start traversals from the beginning, while a pointer to the tail lets you append or remove from the end in constant time. The size counter gives you the current number of nodes without needing to walk through the entire list each time you query the length. This combination supports efficient insertions at both ends and quick size queries, which are common needs in many linked list operations. A single pointer to the head makes tail insertions and size retrieval less efficient, a pointer to a current node is more about traversal state than the list’s structure, and a sentinel node is an implementation detail you might choose in some designs but isn’t standard for the typical, straightforward setup.