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Depth First Search

1. Which one of the following data structures is used in DFS?

a: Heap b: Dequeue c: Linked List d: Stack

2. What is backtracking in DFS?

a: Going to the parent node if all the children nodes have been visited b: Going to the parent node when a children node has been visited c: Going to the sibling node when all the children nodes have been visited d: Going to the sibling node when a children node has been visited