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The Laplace transform of a unit ramp function starting at $t=a$, is

1. $\frac{1}{(s+a)^{2}}$
2. $\frac{e^{-a 15}}{(s+a)^{2}}$
3. $\frac{e^{-\pi s}}{s^{2}}$
4. $\frac{a}{s^{2}}$