Differential Equation 1.1

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A solution for the differential equation $x'(t) + 2x(t) = \delta (t)$ with initial condition $x(0^-) = 0$ is 
(a) $e^{-2t} u(t)$ 
(b) $e^{2t} u(t)$ 
(c) $e^{-t} u(t)$ 
(d) $e^{t} u(t)$

Answer is ( )

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