Let \(n\) be a positive integer and \(a, b\) be two positive integers such that \(a+b=n\). Which of the following are possible values of \(ab\) for all even positive integers \(n\)?
I. \(n+1\)
II. \(n-1\).
III. \(2n-4\)
IV. \(0.25n^{2}\)
V. \(0.25 (n^{2}-4)\)
VI. \(n^{2}\)
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