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The OP-amp circuit shown in the figure is a filter. The type of filter and its cut-off frequency are respectively

1. high pass, $1000 \; \mathrm{rad/sec}$.
2. low pass, $1000 \; \mathrm{rad/sec}$.
3. high pass, $10000 \; \mathrm{rad/sec}$.
4. low pass, $10000 \; \mathrm{rad/sec}$.