8. (20 Points) Suppose Host A wants to send a file to Host B, and the file is 4 million bytes. The path from Host A to Host B consists of three links Li, L and Ls. Host C wants to send a file to Host D, and the file is 5 million bytes. The path from Host C to Hast D consists three links L, L2 and Ls. The transmission rates of these five links are Ri 500 kbps, R 2 Mbps, R -2 Mbps, R 2 Mbps, and Rs -4 Mbps, respectively. The file transfer session between A and B and the file transfer session between C and D equally share the transmission capacity of link a. Assuming no other traffic in the network, what is the throughput for L2. the file transfer between A and B? What is the throughput for the f transfer between C and D? (10 Points) ile b. Dividing the file size by the throughput, roughly how long will it take to transfer the file from Host A to Host B? How long will it take to transfer the file from Host C to Host D? (10 Points)