1.2. Assume a process that requires a series of file reads. We know that the computer system where this process runs also has other processes "running" in multiprogramming fashion, but not simultaneously. We also know that these many file reads do not bring apparent decrease in performance of the system even though I/O operations are very costly in terms of time. [5] (i) What mechanism in the computer system is responsible for enabling multiprogramming and allowing systems to avoid programmed I/O operations? (i) Explain the functionality and role of such mechanism. (iii) How does the mechanism work? Explain all its steps (make references to the course content/slides). (iv) We know that such mechanism is ultimately necessary in any modern computer system; it helps processes handling I/O operations. Let's assume that a system needs to handle three I/O operations almost simultaneously: printing, reading from a file, and obtaining data from a network interface buffer (abstract such operations - do not think of their details). How does a Computer System resolve the issue of receiving an Interrupt while it is still handling an earlier Interrupt? Discuss the possible solution(s)