Is the set of multiples of 4 closed under addition? Explain why or provide a counterexample if not.
A. Yes, because the sum of any two multiples of 4 is also a multiple of 4.
B. Yes, because the sum of any two multiples of 4 is also a multiple of 8.
C. No, and a counterexample is - 4 + (-8) = - 12.
D. No, and a counterexample is 26 + 16 = 42.
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