In figure is shown a system of four capacitors connected across a $10\;V$ battery . Charge that will flow from switch S When it is closed is

Question

$\begin{array}{1 1} 5\;\mu C \;from\;b\;to\;a \\ 20\;\mu C \;from\;a\;to\;b\\ 5\;\mu C \;from\;a\;to\;b \\ zero \end{array} $