A Transmission Line Having a Delay Time of 45 Microseconds

Multiple Choice

A transmission line having a delay time of 45 microseconds and terminated with an open is applied with a 4 VDC incident voltage. At the load end of the line:

A) the voltage changes from 0V to -4V at t = 45 microseconds.
B) the voltage changes from 0V to 8V at t = 45 microseconds.
C) the voltage changes from 0V to 4V at t = 40 microseconds.
D) the voltage changes from 0V to 4V at t = 45 microseconds.
E) the voltage changes from 0V to 8V to t = 90 microseconds.