The magnitude and phase of the complex Fourier series coefficients ܽ$a_{k}$ of a periodic signal $x(t)$ are shown in the figure. Choose the correct statement from the four choices given. Notation: $C$ is the set of complex numbers, ܴ$R$ is the set of purely real numbers, and $P$ ܲis the set of purely imaginary numbers.

$x(t)\in R$

$x(t)\in P$

$x(t)\in (C-R)$

the information given is not sufficient to draw any conclusion about $x(t)$