Classify each of the following as true or false, assuming that a, b, c, and d are whole numbers. If a statement is false, give a counterexample.
a. If d|(a + b), then d|a and d|b
b. If d|(a + b), then d|a or d|b
c. If d|ab, then d|a or d|b
d. If ab|c, then a|c and b|c
e. If a|b and b|a, then a = b
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