GATE Electrical Engineering (EE) 2014 Shift 1 Solved Paper

A combination of 1μF capacitor with an initial voltage v_c(0) = -2V in series with a 100 Ω resistor is connected to a 20 mA ideal dc current source by operating both switches at t = 0s as shown. Which of the following graphs shown in the options approximates the voltage v_s across the current source over the next few seconds?