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Using the segment addition postulate, which is true?

A number line going from negative 9 to positive 9. A closed circle appears at negative 6 and is labeled A. A closed circle appears at negative 1 and is labeled B. A closed circle appears at positive 2 and is labeled C. A closed circle appears at positive 8 and is labeled D.

AB + BC = AD
AB + BC = CD
BC + CD = AD
BC + CD = BD