According to Freudian psychoanalytic theory, a nail-biting adult is "fixated" during which stage of development?

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According to Freudian psychoanalytic theory, nail-biting is considered an oral fixation and is associated with unresolved conflicts or unmet needs during the oral stage (birth to 18 months), where an individual's primary source of pleasure and satisfaction come from oral activities such as sucking, biting, and chewing. Therefore, a nail-biting adult is said to be fixated during the oral stage.

According to Freudian Psychoanalytic Theory, a Nail-Biting Adult Is "Fixated