whAt CAn BE inFErrED ABout thE rElAtionship BEtwEEn lAsEr CommuniCAtions AnD rADios
A．lAsErs hAvE rEplACED All thE rADio DEviCEs.
B．lAsErs hAvE morE ADvAntAgEs ovEr rADios.
C．lAsEr CommuniCAtions ArE BAsED on rADio DEviCEs.
D．lAsErs ArE morE wiDEly AppliED in wAr thAn rADios.