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What is a datum?

  1. A method for calculating land area

  2. A tool used in property appraisal

  3. A point, line, or surface used to measure air space

  4. A legal term for property boundaries

The correct answer is: A point, line, or surface used to measure air space

A datum is a point, line, or surface used as a reference for measurements. Option A is incorrect because a datum is not a method for calculating land area; it is a point, line, or surface used for measurement. Option B is incorrect because a datum is not a tool specifically used in property appraisal; it can be used in any type of measurement. Option D is incorrect because a datum is not a legal term for property boundaries; property boundaries are defined by legal descriptions, not by datums. Therefore, the correct answer is C.