(13) In the three following situations explain which model we should use: (a) user-level threading (b) kernel-level threading (c) hybrid-threading (d) no-threading (i.e. single-threaded application) Explain clearly what the advantages are to the choices you have made, or why the other options are not viable. While making your decision consider things like the amount/type of I/O your application requires. (a) You are writing an application for an operating system (that support thread- ing). The application needs to continuously and simultaneously fetch infor- mation over a network connection, accept input from the user, and format the display to the user. (b) You are writing an application for a single-threaded operating system (i.e. the OS does not support threading). The application waits for a packet of internet information, and then processes the information. The packets come once an hour, and processing takes onlv a few minutes. (c) You are writing an application to monitor a realtime system (i.e. a manufac- turing floor). The OS supports threads but not 'real-time' threads (the o.s. has no way to fulfill specific timing requests). The application needs to contin uously monitor aspects of the real-time system it is monitoring with specific requirements as to the timing. (i.e. every 5 seconds check the heat gauge). If there are N aspects of the real-time system that need to be monitored, each 'check' of that aspect may call a blocking system call