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For the operational amplifier circuit shown, the output saturation voltage are $\pm 15 \:V$. The upper and lower threshold voltages for the circuit are,respectively,

1. $+ 5 \: V$ and $– 5 V$
2. $+ 7 \: V$ and $– 3 \: V$
3. $+ 3 \: V$ and $- 7 \: V$
4. $+ 3 \: V$ and $– 3 \: V$