For each positive integer n, let f1(n) be twice the number of positive integer divisors of n, and for j≥2, let fj(n)=f1(fj−1(n)). For how many values of n≤50 is f50(n)=12?<spanclass=′latex−bold′>(A)</span>7<spanclass=′latex−bold′>(B)</span>8<spanclass=′latex−bold′>(C)</span>9<spanclass=′latex−bold′>(D)</span>10<spanclass=′latex−bold′>(E)</span>11