Q3. Suppose that Bob sent N back-to-back packets, with each packet composed of 8000 bits, to Alice over 4 links (shown below). Suppose that the transmission rate of each link is 32 Kbps (note, 1 Kbps = 10 bps). Suppose that the end-to-end delay of sending all the packets to Alice, i.e., the time taken for the last bit of the nth packet to arrive at Alice since Bob started transmitting the first bit of the first packet, was 25 seconds. Find N, i.e., the number of packets that Bob sent to Alice. Consider only the transmission delay that occurs in sending packets in your analysis. Show the steps used in your derivation in detail. (8 points) Bob Alice 32 Kbps 32 Kbps 32 Kbps 32 Kbps