Which of the following is an example of a unique identifier that can help locate a missing person?

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A scar is a permanent, unique mark that stays with a person over time, making it a reliable clue for identifying or locating someone. Unlike hair color or height, which can change or be described imprecisely, scars remain consistent and are often distinctive enough to match a missing person with a body or witness description. Tattoos can be distinctive too, but scars are universally persistent features that investigators can rely on, especially when other details are uncertain.