3) (25 points) Consider the network set-up in Problem 2, but…

3) (25 pоints) Cоnsider the netwоrk set-up in Problem 2, but now suppose we wаnt to uploаd the file of size F bit from the client C to the server S. Thаt is, the direction of transmission is: Client  =>  Access link RC = R bit/s  => Backbone link RB2 = 10R  => Backbone link RB1 = 5R  =>  Access link RS = 2R  => Server. Drawing a labeled separate space-time diagram for each of the following parts a), b), and c) is required in order to receive credit. a) Suppose message switching is used, i.e., the entire file is treated as one large packet. How long does it take to upload the file? b) Suppose the file is broken up into packets, each packet with P information bits, and packet switching is used. Header bits are negligible. How long does it take to upload the file? c) Suppose circuit switching is used. The circuit that we set up across all the network links has a circuit transmission bit rate of R/2 bit/s. Assuming ts seconds set up time, how long does it take to upload the file?