A battery is connected to a lightbulb through switch S. A second switch K is wired in parallel with the bulb so that closing K provides a conducting path of negligible resistance around the bulb. Initially both switches are open and the bulb is dark. Which of the following best describes what happens when only switch K is closed?
(a) The bulb glows dimly because the current divides between the bulb and the low-resistance shunt.
(b) The bulb flashes briefly and then goes out as the filament is momentarily charged.
(c) The bulb remains dark because the circuit is still open; the low-resistance path is on the wrong side of switch S.
(d) The bulb lights brightly because closing the shunt lowers the circuit resistance and increases the current through the bulb.