A battery with electromotive force (e.m.f.) $E$ and negligible internal resistance is linked to four resistors with resistances $R_1$, $R_2$, $R_3$ and $R_4$. The currents $I_1$ and $I_2$ through the resistors are shown. Which equation is correct?
- A$0 = I_1(R_1 + R_2) + I_2(R_3 + R_4)$
- B$0 = I_1(R_1 + R_2) - I_2(R_3 + R_4)$
- C$E = I_1(R_1 + R_2) + I_2(R_3 + R_4)$
- D$E = I_1(R_1 + R_2) - I_2(R_3 + R_4)$