In the circuit shown below what is the output voltage $$\left( {{V_{out}}} \right)$$ in Volts If a silicon transfer $$Q$$ and an ideal op-amp are used?

For the circuit shown below, the correct transfer characteristics is

A low pass filter with a cut-off frequency of $$30Hz$$ is cascaded with a high pass filter with a cut off frequency of 20Hz. The resultant system of filters coil function as

Given that the op-amp is ideal, the $$O/P$$ voltage $${V_0}$$ is