The transfer function of a second order low pass filter shown in Figure is
A. $$\frac{1}{{{{\text{R}}^2}{{\text{C}}^2}{{\text{s}}^2} + 3{\text{RCs}} + 1}}$$
B. $$\frac{{{\text{RCs}}}}{{{{\text{R}}^2}{{\text{C}}^2}{{\text{s}}^2} + 3{\text{RCs}} + 1}}$$
C. $$\frac{{{{\text{R}}^2}{{\text{C}}^2}{{\text{s}}^2} + 1}}{{{{\text{R}}^2}{{\text{C}}^2}{{\text{s}}^2} + 3{\text{RCs}} + 1}}$$
D. $$\frac{{{{\text{R}}^2}{{\text{C}}^2}{{\text{s}}^2}}}{{{{\text{R}}^2}{{\text{C}}^2}{{\text{s}}^2} + 3{\text{RCs}} + 1}}$$
Answer: Option A
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