Three capacitors. C, 2 uF.C,=1 uF. and C,-4 nF, are connected in series to a 5-V source. The equivalent capacitance of the circuit is 25 nF. Now the three capactors are reconnected in parallel with the same source. What is the charge stored in the second capacitor? Select one: a. 4,5 uc O b.9 uc O d.5 uC