To move from a node toward the previous node in a doubly linked list, which pointer do you follow?

• A. Next.
• B. Prev.
• C. Parent.
• D. Child.

Answer: (B)

Navigation in a doubly linked list relies on two pointers: one to the next node and one to the previous node. To move toward the node that comes before the current one, you follow the previous pointer. This pointer directly links each node to its predecessor, so stepping back in the list is accomplished by jumping via that reference. The next pointer, in contrast, moves you forward to the following node. Terms like parent and child belong to tree structures, not doubly linked lists, so they aren’t used here. If you’re at the head, the previous pointer is typically null, and if you’re at the tail, the next pointer is typically null.