Write the set using the roster method.{x|x is a counting number and multiple of 3}

A. {6, 9, 12, . . .}
B. {0, 3, 6, 9,. . .}
C. {-9, -6, -3, 0, 3, 6, 9,. . .}
D. {3, 6, 9, . . .}


Answer: D

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