Which of the following statements is the biconditional for " If x = 1 0, then x + 3 = 13 ". a. If x + 3 = 13, then x = 10. b.If x ≠ 10, then x + 3 ≠ 13 c. If x + 3 ≠ 13, then x ≠ 10 d.x + 3 = 13 if and only if x = 10

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