The circuit configuration shown above is:

In the given circuit, figure 1 is an integrator circuit while figure 2 is a Schmitt trigger circuit.

The Schmitt trigger always produces a square waveform for any type of input signal.

The output of the Schmitt trigger is fed back to the input of the integrator, the integrator will integrate the square waveform.

Hence, the output of the integrator will be a triangular waveform.

Therefore, the correct answer is option 4.