Classify each of the following statements as true or false, for all whole numbers a, b, and c, with b ≠ 0.
a. 7 | 21 implies 7 | 212.
b. If b | a, then (b + c) | (a + c).
c. If b | a, then b2 | a3.
d. If b | a, then b | (a + b).
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