The Fourier series expansion of a real periodic signal with fundamental frequency $\mathrm{f}_0$ is given by $$ g_p(t)=\sum_{n=-\infty}^{\infty} c_n e^{j 2 \pi n f_\omega t} $$ It is given that $c_3=3+j 5$. Then $c_{-3}$ is
- $5+j 3$
- $-3-j 5$
- $-5+j 3$
- $3-j 5$