The figure below shows an institutional network connected to the Internet. Hosts in this institutional network can download files from both remote origin servers and a local web cache onigin publik Mbp access link lweb Assume the following: An average file size = 100,000 bits. The average request rate for files from institution's browsers = 40 The propagation delay from the institutional router to any origin server and back to router i3 2 seC requests/sec. The average time to download a file is the sum of the average access delay and the (round-trip) propagation delay from the server where the file resides in. The average access delay at a link can be calculated by c, where T is the average time required to send a file over the link (ie., the transmission delay), u is the utilization at the link and is defined as (average bits transmitted per second)/(link rate)