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# Which of the following binary operations is commutative in the set of integers?

### Question

Which of the following binary operations is commutative in the set of integers?

### Options

A) $$a – b = a – 2b$$

B) $$a \cdot b = a + b – ab$$

C) $$a – b = a^2 + b$$

D) $$a \cdot b = \frac{a(b + 1)}{2}$$