The impedance of a circuit,when a resistance $R$ and an inductor of inductance $L$ are connected in series in an $AC$ circuit of frequency $f$ is
- A$\sqrt{R + 2\pi^2 f^2 L^2}$
- B$\sqrt{R + 4\pi^2 f^2 L^2}$
- C$\sqrt{R^2 + 4\pi^2 f^2 L^2}$
- D$\sqrt{R^2 + 2\pi^2 f^2 L^2}$
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