Integrate : $ \int \sqrt{\sin ^3 x}. \cos x \;dx$

Question

\[\begin {array} {1 1} (a)\;\frac{2}{5} (\cos x)^{5/2}+c \\ (b)\;\frac{2}{5}(\sin x)^{5/2}+c \\ (c)\;\frac{2}{3}(\tan x)^{3/2} \\ (d)\;None \end {array}\]