Consider an application that transmits data at a steady rate (e.g., the sender generates an N-bit unit of data every k time units, where k is small and fixed). Also, when such an application starts, it will continue running for a relatively long period of time. Answer the following questions and justify your answer: a) Would a packet-switched network or a circuit-switched network be more appropriate for this application? Why? b) Suppose that a packet-switched network is used and the only traffic in this as described above. Furthermore, assume that the sum of the application data rates is less than the capacities of each link. Is some form of congestion control needed? Why