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Method of Undetermined Coefficients with Exponential Forcing

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A particular solution of:

$$\begin{equation} y'' - 3y' - 4y = 8e^{2t} \end{equation}$$

...is:

A

$y(t) = \cfrac{4}{3} e^{2t}$

B

$y(t) = -\cfrac{4}{3} e^{2t}$

C

$y(t) = \cfrac{4}{3} e^{t}$

D

$y(t) = 8 e^{2t}$