In a circuit \( L, C \) and \( R \) are connected in series with an alternating voltage source o...

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In a circuit \( L, C \) and \( R \) are connected in series with an alternating voltage source of frequency \( f \). The current leads the voltage by \( 45^{\circ} \). The value of \( C \) is
(a) \( \frac{1}{2 \pi f(2 \pi f L+R)} \)
(b) \( \frac{1}{\pi f(2 \pi f L+R)} \)
(c) \( \frac{1}{2 \pi f(2 \pi f L-R)} \)
(d) \( \frac{1}{\pi f(2 \pi f L-R)} \)
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