$\frac{\text{E}\text{x}\text{a}\text{m}\text{p}\text{l}\text{e}2\text{:}\text{T}\text{h}\text{e}\text{F}\text{o}\text{u}\text{r}\text{i}\text{e}\text{r}\text{s}\text{e}\text{r}\text{i}\text{e}\text{s}representationofan\text{i}\text{m}\text{p}\text{u}\text{l}\text{s}\text{e}\text{t}\text{r}\text{a}\text{i}\text{n}\text{d}\text{e}\text{n}\text{o}\text{t}\text{e}\text{d}by\text{:}}{}s(t)={\displaystyle \underset{n=-}{\overset{?}{}}}(t-n{T}_0)$ is given by

$($a$)(\frac{1}{T_0}){\displaystyle \underset{n=-}{\overset{}{}}}$exp$(-j2n\frac{t}{T_0})$

$($b$),(\frac{1}{T_0}){\displaystyle \underset{n=-}{\overset{}{}}}$exp$(-jn\frac{t}{T_0})$

$($c$)(\frac{1}{T_0}){\displaystyle \underset{n=-}{\overset{}{}}}$exp$(jn\frac{t}{T_0})$

$($d$)(\frac{1}{T_0}){\displaystyle \underset{n=-}{\overset{}{}}}$exp$(j2n\frac{t}{T_0})$