thE promising iDEA mEntionED in thE First pArAgrAph_______.
A．hAs mAturE tEChnology to support it
B．hAs A stABlE EArly AppliCAtion—thE x10 systEm
C．is to trAnsmit DAtA By powEr linEs within thE housE
D．FostErED proDuCts whiCh AFFECtED wirElEss nEtwork