$15.$Digital subscriber lines:A$)$ operate over existing telephone lines to carry voice, data, and video.B$)$ operate over coaxial cable lines to deliver Internet access.C$)$ are very$-$high$-$speed data lines typically leased from long$-$distance telephone companies.D$)$ have up to twenty$-$four $64-$Kbps channels.E$)$ are assigned to every computer on the Internet