Three inverting amplifiers, each with \(R_{2}=150 \mathrm{k} \Omega\) and \(R_{1}=15 \mathrm{k} \Omega\), are connected in cascade. Each op-amp has a low-frequency gain of \(A_{o}=5 \times 10^{4}\) and a unity-gain bandwidth of \(f_{T}=1.5 \mathrm{MHz}\).

(a) Determine the low-frequency closed-loop gain and the \(-3 \mathrm{~dB}\) frequency of each stage.

(b) Determine the low-frequency closed-loop gain and the \(-3 \mathrm{~dB}\) frequency of the overall system.