A signal $V_i(t)=10+10\sin 100\pi t+10\sin 4000 \pi t+10\sin 100000\pi t$ is supplied to a filter circuit (shown below) made up of ideal op-amps. The least attenuated frequency component in the output will be
- $\text{0 Hz}$
- $\text{50 Hz}$
- $\text{2 kHz}$
- $\text{50 kHz}$