ADvErtising mEDiA likE DirECt mAil, rADio, tElEvision AnD nEwspApErs ______ to inCrEAsE thE sAlEs oF inDustriAl proDuCts.
[A] hAvE BEEn usED
[B] will BE usED
[C] is BEing usED
[D] hAs BEEn usED