The voltage wave given by $$v = 4 \cos \omega t$$ produces a current wave $$i = 1.5 \cos \omega t - 2.598 \sin \omega t$$ in a circuit. The current wave

A

leads voltage wave by $$60^\circ$$

B

lags voltage wave by $$60^\circ$$

C

leads voltage wave by $$30^\circ$$

D

lags voltage wave by $$30^\circ$$