Suppose there are two links between source and destination, with one router connecting the two links. Each link is 5,000km long with a transmission rate of 10Mbps. Assume the propagation speed is 2108 meters/sec. There is a 30 Mbit MP3 file sent as one message. Suppose there is no congestion, so the message is transmitted onto the second link as soon as the router receives the entire message. The end-to-end delay is a. 6.05 seconds b. 6.1 seconds c. 3.05 seconds d. none of the above