Using a Table of Laplace Transforms, Find the Laplace Transform $f(t)=t e^{-3 t}$

Multiple Choice

Using a table of Laplace transforms, find the Laplace transform of $f(t) =t e^{-3 t}$ .

A) $\frac{1}{(s-3) ^{2}}$
B) $\frac{\mathrm{s}}{(\mathrm{s}+3) ^{2}}$
C) $\frac{s^{2}}{s-3}$
D) $\frac{1}{(s+3) ^{2}}$