If x(t) = e-t u(t) and y(t) = e-3tu(t), then y(t) * x(t) will be 

1
(e-t – e-3t) u(t)
2
\(\frac{e^{-3t}-e^{-t}}{2}u(t)\)
3
\(\frac{e^{-t}-e^{-3t}}{2}u(t)\)
4
\(\frac{e^{-t}+e^{-3t}}{2}u(t)\)

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