Find the Second Harmonic of the Function $h(x)=$ $\left\{\begin{array}{c}2 \pi \\0\end{array}\right.$

Multiple Choice

Find the second harmonic of the function $h(x) =$$\left\{\begin{array}{c}2 \pi \\0\end{array}\right.$$\begin{aligned}-\pi< \\0<\end{aligned}$$\begin{array}{l}x \leq 0 \\x \leq \pi\end{array}$ .

A) $\frac{4}{3} \sin 3 x$
B) $-\frac{4}{3} \sin 3 x$
C) $\frac{2}{3} \sin 3 x$
D) $-\frac{2}{3} \sin 3 x$
E) 0