If a triangular wave with a fundamental frequency fo = 1kHz is fed to the input of an inverting single op-amp ideal differentiator, which of the following statements would best describe the output voltage? a. A triangular wave signal of frequency fo 180 degrees out of phase with the input b. A square wave of frequency fo and 90 degrees out-of-phase with the input c. A square wave of frequency fo and 180 degrees out of phase with the input d. A sinusoidal wave of frequency fo and 180 degrees out of phase with the input