"it is A DistinCt group AnD not A trAnsitory ClAss BEtwEEn thE whitE AnD BluE" mEAns grAyCollAr workErs will BE A ______ group oF proFEssions.
A．DEFinitE AnD sEpArAtE
B．short-tErm AnD ChAngEABlE
C．mErEly tEmporAry