Which method is used to add a value to the beginning of a doubly linked list?

The method typically used to add a value to the beginning of a doubly linked list is commonly referred to as "AddHead." This method is designed specifically for inserting nodes at the head of the list, meaning that when a value is added, it becomes the first element of the list.

When implementing a doubly linked list, each node contains references to both the next node and the previous node. To efficiently perform the addition at the head of the list, "AddHead" typically involves several steps: creating a new node, adjusting the pointers of the new node to reference the current head, and updating the head pointer of the list to point to this new node. This process ensures that the integrity of the doubly linked list is maintained both forwards and backwards.

The other options, while they may seem plausible, do not represent the commonly used terminology recognized in the context of linked lists. "AddToFront," "AddStart," and "AddFirst" are terms that could be interpreted similarly, but they are not the standard nomenclature typically adopted in data structure literature for this operation. Standardization in method naming helps ensure that implementations and discussions about linked lists remain consistent across various contexts.