A.\(i = \cos \left( {100\pi t - \frac{\pi }{4}} \right)A\)
B.\(i = 2\cos \left( {100\pi t + \frac{\pi }{4}} \right)A\)
C.\(i = \cos \left( {100\pi t + \frac{\pi }{4}} \right)A\)
D.\(i = 2\cos \left( {100\pi t - \frac{\pi }{4}} \right)A\)