Let S(n) be a statement parameterized by a positive integer n. A proof by strong induction is used to show that for any n212, S(n) is true. The inductive step shows that for any k215, if S(k-3) is true, then S(k+1) is true.Which fact or set of facts must be proven in the base case of the proof? O (12) O S(15) O S(12), S(13), and S(14) O S(12), S(13), S(14), and S(15)

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