Which statement about channels is true?

A、Channelsworktogethertoproduce,distributeandsellproductsorservices;
B、Channelsareselectedbyconsumers,andtheselectedchannelsarebeneficialforconsumerswhenbuyingproducts;
C、Withthedevelopmentofchannels,theboundariesamongchannelshavebecomeindistinct,andchannelclassificationisnotveryimportant;
D、Onlinechannelsaremuchmoreimportantthanofflinechannels