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A circuit is said to be unstable if its output increases with time instead of achieving fixed value. In fact the output keeps on increasing until the system breaks down. Therefore, unstable systems are impractical and need to be made stable.

In closed loop system (control system) the standard form of representing a system is composed of two blocks.

Slew rate is the maximum rate of change of output voltage caused by a step input voltage with respect to time.

An op-amp slew rate is related to its frequency response. Usually op-amps with wider bandwidth have higher (better) slew rate.

In DFT, frequency domain and time domain are discrete in nature.
The Discrete Fourier Transform (DFT) is the equivalent of the continuous Fourier.
Transform for signals known only at. instants separated by sample times ? (i.e. a finite sequence of data).

A frequency response plot is obtained by plotting the gain of the op-amp responding to different frequencies.

Although frequency response and bode plots indicate the effect of frequency variation on gain, the Bode plot is generally used for stability determination and network design.

Two types of plots can be obtained using Bode plot. They are magnitude versus frequency and phase angle versus frequency plots.

When the operating frequency is increased the gain of the amplifier decrease. As it is linearly related to frequency, the phase shift is logarithmic related to frequency.

741c belongs to later generation op-amp and it has internal compensating network.
In internal compensated op-amp, the compensating network is designed into the circuit to control the gain and phase shift of the op-amp and they are called as compensating op-amp.
Therefore the correct option is A.

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