You are sending a 500KB file to a destination 20km away. The channel data rate is 100Mbps and the propagation speed is 2.4x10⁸ ms⁻1. Each data frame carries 1400 bits of data plus 50 bits of overhead. What is the transmission time for the entire file?
a) 0.2 seconds
b) 1 second
c) 2 seconds
d) 5 seconds