A battery that has internal resistance is joined to a parallel circuit containing two resistors and a switch $S$, as illustrated. At the start, switch $S$ is open. What change is observed in the voltmeter and ammeter readings when switch $S$ is closed?
- Avoltmeter reading decreases, ammeter reading increases
- Bvoltmeter reading decreases, ammeter reading decreases
- Cvoltmeter reading increases, ammeter reading increases
- Dvoltmeter reading increases, ammeter reading decreases