Voltage and current in an ac circuit are given by $\mathrm{V}=5\sin \mathrm{\hspace{0.17em}}\left(100\mathrm{\pi t}-\frac{\mathrm{\pi }}{6}\right)$  and  $\mathrm{I}=4\sin \mathrm{\hspace{0.17em}}\left(100\mathrm{\pi t}+\frac{\mathrm{\pi }}{6}\right)$

• A

  Voltage leads the current by ${30}^{\mathrm{o}}$

• B

  Current leads the voltage by ${30}^{\mathrm{o}}$

• C

  Current leads the voltage by ${60}^{\mathrm{o}}$

• D

  Voltage leads the current by ${60}^{\mathrm{o}}$