The period of $f(x)=\cos \bigg(\large\frac{x}{3}\bigg)$$+\sin \bigg(\large\frac{x}{2}\bigg)$ is

Question

$$\begin {array} {1 1} (a)\;2 \;\pi & \quad (b)\;4\; \pi \\ (c)\;8\; \pi & \quad (d)\;12\; \pi \end {array}$$