The current shown by the ammeter in the circuit below is $I$. A different circuit, which has the same voltage supply, two switches, an ammeter and two resistors, each with resistance $R$, is shown. Which row is incorrect?
- A$S_1$ closed, $S_2$ closed, ammeter reading $I$
- B$S_1$ closed, $S_2$ open, ammeter reading $I$
- C$S_1$ open, $S_2$ closed, ammeter reading $I$
- D$S_1$ open, $S_2$ open, ammeter reading $0$