5. (40 points) Calculate the total time required to transfer a 500KB file in the following cases, assuming an RTT of 50ms, a packet size of 1KB and an initial 2 x RTT of "handshaking" before data is sent a) The bandwidth is 1Mbps, and data packets can be sent continuously. b) The bandwidth is 1Mbps, but after we finish sending each data packet, we must wait for one RTT before sending the next. c) The bandwidth is "infinite," meaning that we take transmit time to be zero, and up to 20 packets can be sent per RTT. d) The bandwidth is infinite, and during the first RTT we can send one packet (211), during the second RTT we can send two packets (22.1), during the third RTT we can send four packets (231), and so on