A circuit contains an ideal battery, a light-bulb, and two switches:
• Switch S1 is in series with the bulb.
• Switch S2 is connected in parallel with the bulb, forming a direct conducting path that bypasses the bulb when closed.
Which combination of switch positions results in a closed circuit in which current flows but the bulb remains dark because it is shorted?
a) S1 open, S2 closed
b) S1 closed, S2 closed
c) S1 closed, S2 open
d) S1 open, S2 open