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4. HTTP Protocol (20 points) Consider a short link, over which a sender can transmit at a rate of 15,000 bits/sec in both directions. Suppose that packets containing data are 150,000 bits long, and packets containing only control (e.g., ACK or hand-shaking) are 150 bits long. Now consider the HTTP protocol and suppose that each downloaded object is 150,000 bits long, and that the initial downloaded object contains 10 referenced objects from the same sender (ignore the index page downloading time, and connection close time). (Proof is needed) a. What is the total time needed to receive all the 10 objects using non-persistent HTTP connections? b. Now consider persistent HTTP download, what is the total time to receive all the 10 objects