E8B13 (B) 
What is time division multiplexing?
A. Two or more data streams are assigned to discrete sub-carriers on an FM transmitter
B. Two or more signals are arranged to share discrete time slots of a digital data transmission
C. Two or more data streams share the same channel by transmitting time of transmission as the sub-carrier 
D. Two or more signals are quadrature modulated to increase bandwidth efficiency
