The magnitude and phase of the complex Fourier series coefficient ak...

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The magnitude and phase of the complex Fourier series coefficient 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 number, R is the set of purely real numbers, and P is the set of purely imaginary numbers.

A. $$x\left( t \right) \in R$$

B. $$x\left( t \right) \in P$$

C. $$x\left( t \right) \in \left( {C - R} \right)$$

D. The information given is not sufficient to draw any conclusion about x(t)

Answer: Option A

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