The error of a method is $E(h)=h^7+8h^4,$ for any $O(h^{})0.$ What $is$ the exponent $of$ the tightest asymptotic $(big-O)$

bound $on$ the error, $i.e.,$ what $is$ where the tightest asymptotic bound $isO(h^{})?$ Note: The answer $isan$ integer.