Which of the following is true about the magnitude spectrum and phase spectrum of  DTFT？
A、DTFT of discrete-time signal can be divided into magnitude spectrum and phase spectrum, and both are complex function of ω.
B、The magnitude of a discrete-time signal is an even function of ω，while the phase spectrum of that is an odd function of ω.
C、If the phase spectrum of a discrete-time signal always has a discontinuous amplitude at πand -π with a jump of 2π, it is possible to be brought by phase wrap.
D、Magnitude spectrum and phase spectrum is the only form of DTFT of discrete-time signal.