If A = {1, 2, 3, 4, 5, 6, 7, 8} then the...

If `A = {1, 2, 3, 4, 5, 6, 7, 8}` then the number of onto functions `f: A -> A` so the `f(x) != x`, f(x) = even when x is even and f(x) = odd when x odd is (A) 18 (B) `9^9` (C) 81 (D) 64

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