The impulse response h(t) of a linear invariant continuous time system is given by h(t) = exp (- 2t) u(t), where u(t) denotes the unit step function. The output of this system to the sinusoidal input x(t) = 2cos(2t) for all time t, is

• A. 0
• B. 2-0.25 cos (2t - 0.125p)
• C. 2-0.5 cos (2t - 0.125p)
• D. 2-0.5 cos (2t - 0.25p)