JEE Main 2015 Physics Question- In figure is shown a system of four capacitors connected

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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 :

Option 1) 5 \: \mu C\: f\! rom\: b\: to\: a Option 2) 20 \: \mu C\: f\! rom\: a\: to\: b Option 3) 5 \: \mu C\: f\! rom\: a\: to\: b Option 4) zero