Use an alternative method to express the set.{21, 28, 35, ..., 105}
A. {x : x is a multiple of 7 greater than 21 and less than 105}
B. {b : b is a multiple of 7 greater than or equal to 21}
C. {w : w is a multiple of 7}
D. {t : t is a multiple of 7 greater than 20 and less than 106}
Answer: D
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