A battery, a switch, and a lightbulb are connected in series. The switch is open. Which of the following statements best explains whether conventional current exists in the circuit at this moment?
a) A very small conventional current flows through the air gap of the open switch because air has a finite resistance.
b) No conventional current exists because the open switch prevents formation of a closed conducting path.
c) Conventional current starts at the battery’s positive terminal and travels through the circuit until it is physically blocked at the open switch contacts.
d) A small conventional current circulates only inside the battery, since the external circuit is open.