Question: If an unbounded queue is implemented using a doubly - linked list, Question 3 7 Select one: its enqueue method is O ( 1 )

If an unbounded queue is implemented using a doubly-linked list,
Question 37Select one:
its enqueue method is O(1), and its dequeue method is O( n ).
cross out
its enqueue method is O(1), and its dequeue method is O(1).
cross out
its enqueue method is O( n ), and its dequeue method is O(1).
cross out
its enqueue method is O( n ), and its dequeue method is O( n ).

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