What is the formula of lower cut-off frequency of an RC coupled amplifier?

1
\(f_L = \frac{\pi }{{2RC}}\)
2
\(f_L = \frac{R}{{2\pi C}}\)
3
\( f_L = \frac{1}{{2\pi RC}} \)
4
\(f_L = \frac{C}{{2\pi R}}\)

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