Which of the following scenarios exhibits a function relation? Take the first set listed to be the domain of the relation.

A relation is a function when each element in the domain is paired with exactly one element in the other set. Each person with a Social Security card has one Social Security number, so this relation is a function. The other choices can pair one domain element with several elements—for example, many trees can have the same height, and many students can share a birthday.

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