Output of Schimitt trigger is-

Correct option is A

​$$V_{UT} \text{ (Upper Threshold Voltage)} = \left( \frac{R_2}{R_1 + R_2} \right) (+V_O) \\V_{LT} \text{ (Lower Threshold Voltage)} = \left( \frac{R_2}{R_1 + R_2} \right) (-V_O)$$​​