Which of the following statement is false about the inverse ZT？

A、ThecontourintegraldefinitionofinverseZTcanbededucedbyinverseDTFT.;
B、ThecontourintegraldefinitionofinverseZTcanbesolvedbyResidueMethod.;
C、ThecontourintegraldefinitionofinverseZTcanbesolvedonlybyResidueMethodorcontourintegration.;
D、InthecontourintegraldefinitionofinverseZT，thecontourCisacounterclockwiseclosedlineintheROCofz-transform.