What is the domain of the relation? { (-4.5, 0), (-3, 9), (0.9, 0), (4, - 7.8), (4, 0), (17, 3) }

a. {0.9, 4, 17}

b. { - 4.5, - 3, 0.9, 4, 17}

c. {-7.8, 0, 3, 9}

d. {-4.5, - 3}

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