If $P(A)=\Large\frac{2}{5},\normalsize P(B)=\Large\frac{3}{10}$ and $P(A\cap B)=\Large\frac{1}{5},$then P(A|B).P(B'|A') is equal to

Question

$\begin{array}{1 1}(A)\;\large\frac{5}{6}\\(B)\;\large\frac{5}{7}\\(C)\;\large\frac{25}{42}\\(D)\;1\end{array}$