in the grid (us) the transmission lines: a. none of the choices are correct b. only connects the generator substations to load centers. c. connect the generator substations to distribution substations but are not connected to each other at any specific location. d. not only connect the generator substations to load centers but also are connected to each other at specific locations called interconnects. e. connect the generator substations to distribution substations but are not connected to each other at any specific location except if the run as parallel circuits.