Consider a communication network with the following architecture: Client host X is connected to a server host Y via three communication links: a client access link with transmission bit rate R = R bits, a backbone link with transmission bit rate R2 = 10R bit/s, and a server access link with transmission bit rate R3 = R bits. That is, there are two routers between host X and host Y Each access link has a distance (length) of d meters, while the backbone link has a length of 200 meters. The routers interconnecting the communication links have unlimited buffer capacity and negligible nodal processing delay In the following sub-problems a), b), and c), we examine the transmission of a file of size Fbits with different transmission protocols over the described network architecture Aside from our examined transmission of the file of size Ebits, there are no other traffic flows in the considered network a) Consider message switching, i.e., the entire file is transmitted as one large packet How long does it take to transmit the file