In a switching circuit, if the combination $(S_1 \land S_2)$ is connected in parallel to the combination $(S_1' \land S_2')$, then the room is lit only when
- A$S_1$ is ON and $S_2$ is OFF
- B$S_1$ is OFF and $S_2$ is ON
- C$S_1$ and $S_2$ both ON or $S_1$ and $S_2$ both OFF
- DThe room is always lit.
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