Question: In singly linked structure implementation of a queue, where does an element be removed ( dequeue ) in order to have O ( 1 )

In singly linked structure implementation of a queue, where does an element be removed (dequeue) in order to have O(1)?
Group of answer choices
At the center position in the singly linked structure
At any position in the singly linked structure
At the tail of the singly linked structure
At the head of singly linked structure

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