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 `45^0` . The value of c is,
Options:
(a) `1/(2pif(2pifL+R))`
(b) `1/(pif(2pifL+R))`
(c) `1/(2pif(2pifL-R))`
(d) `1/(pif(2pifL-R))`