________ attached to television sets in participating homes now record when the set is on and to which channel it is tuned
A) Tachistoscopes
B) Polygraphs
C) GPS systems
D) Audiometers
E) Galvanometers
D
Business
A) Tachistoscopes
B) Polygraphs
C) GPS systems
D) Audiometers
E) Galvanometers
D