Consider the analog signal $$x(t) = 3 \cos 100 \pi t$$. If the signal is sampled at 200 Hz,the discrete time signal obtained will be

A

$$3 \cos(\frac{\pi n }{4})$$

B

$$3 \cos(\frac{\pi n }{2})$$

C

$$3 \cos(\pi n)$$

D

$$3 \cos(\frac{\pi n }{3})$$