Which of the following sets are closed under scalar multiplication? (i) The set of all matrices in M22 such that A2 = A (ii) The set of all vectors in R° of the form (a, b, 8a+ 6b). (iii) The set of all polynomials a + bx + cx² in P2 such that ac = 0.

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A: Explanation of the answer is as follows

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