Which of these four numbers \sqrt{\pi^2},\,\sqrt[3]{.8},\,\sqrt[4]{.00016},\,\sqrt[3]{\minus{}1}\cdot \sqrt{(.09)^{\minus{}1}}, is (are) rational:
<spanclass=′latex−bold′>(A)</span>none<spanclass=′latex−bold′>(B)</span>all<spanclass=′latex−bold′>(C)</span>the first and fourth<spanclass=′latex−bold′>(D)</span>only the fourth<spanclass=′latex−bold′>(E)</span>only the first