Which of the following actions must be taken to add a node X at the beginning of a doubly-linked list?
I Update the next reference in the node before the position where X will be placed
II Update the previous reference in the node after the position where X will be placed
III Update the list's first reference
A) I
B) II
C) I and II
D) II and III

Question

Quizplus · Accepted Answer

To add a node at the beginning of a doubly-linked list, you must update the previous reference in the current first node (II) and update the list's first reference to point to the new node (III).

Which of the Following Actions Must Be Taken to Add