Q4 (7 points). Consider the figure below, for which there is an institutional network connected to the Internet. Suppose that the average object size is 1 Mbits and that the average request rate from the institutions's browsers to the origin servers is 16 requests/sec (each request is for one object). Also, suppose that the amount of time it takes from when the router on the Internet side of the access link forwards an HTTP request until it receives the response is 3 seconds on average. If we model the total average response time as the sum of the average access delay (that is, the delay from Internet router to institution router) and the average Internet delay, and if we consider the average access delay to be /1, where is the average time required to send an object over the access link, is the arrival rate of objects to the access link, and is the traffic intensity on the access link, answer the following questions: a) (3 points) Find the total average response time in seconds. b) (4 points) Suppose a Web cache is installed in the institutional LAN, and suppose that the cache miss rate is 0.4. Find the total average response time in seconds