Which of the following is true about the magnitude spectrum and phase spectrum of DTFT？

A、DTFTofdiscrete-timesignalcanbedividedintomagnitudespectrumandphasespectrum,andbotharecomplexfunctionofω.;
B、Themagnitudeofadiscrete-timesignalisanevenfunctionofω，whilethephasespectrumofthatisanoddfunctionofω.;
C、Ifthephasespectrumofadiscrete-timesignalalwayshasadiscontinuousamplitudeatπand-πwithajumpof2π,itispossibletobebroughtbyphasewrap.;
D、MagnitudespectrumandphasespectrumistheonlyformofDTFTofdiscrete-timesignal.