A unit step voltage $$2u(t - \theta)$$ is applied in a series RC circuit with $$R = 2Ω, C = 1F$$. Assuming zero initial conditions, find i(t)

A

$$i(t) = u(t) e^{-0.5(t)} A$$

B

$$i(t) = u(t - 2 \theta) e^{-0.5(t - 2 \theta)} A$$

C

$$i(t) = u(t - \theta) e^{-O.5(t - \theta)} A$$

D

$$i(t) = u(t - \theta) e^{-(t - \theta)} A $$