Consider the signal $$x(t)= \begin{cases}2\cos (t)+ \cos(2t) & t < 0\\2\sin (t)+ \sin(2t) & t \geq 0\end{cases}$$

The signal X(t) is:

A

periodic with period = $$2\pi$$

B

periodic with period =$$\pi$$

C

non-periodic

D

periodic with period = $$\frac{\pi}{2}$$