If n and y are positive integers and 450y = $${n}^{3}$$, which of the following must be an integer?
I.$$\frac{y}{{3}*{2}^{2}*{5}}$$
II.$$\frac{y}{{3}^{2}*{2}*{5}}$$
III.$$\frac{y}{{3}*{2}*{5}^{2}}$$
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