If signal x(t) = 2 + cos (50 πt) is sampled with sampling frequency 40 Hz, then the sampled discrete time signal x[n] will be given by:
1
2 + cos (πn)
2
\(2 + \cos \left( {\frac{{3\pi }}{4}n} \right)\)
3
\(2 + \cos \left( {\frac{\pi }{4}n} \right)\)
4
\(2 + \cos \left( {\frac{\pi }{2}n} \right)\)