What is the formula of lower cut-off frequency of an RC coupled amplifier?
A. $${{\text{f}}_{\text{L}}} = \frac{1}{{2\pi {\text{RC}}}}$$
B. $${{\text{f}}_{\text{L}}} = \frac{\pi }{{2{\text{RC}}}}$$
C. $${{\text{f}}_{\text{L}}} = \frac{{\text{R}}}{{2\pi {\text{C}}}}$$
D. $${{\text{f}}_{\text{L}}} = \frac{{\text{C}}}{{2\pi {\text{R}}}}$$
Answer: Option A
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