The following four requests could come in to an operating system as it is running on a computer system. • the clock in the computer has just "ticked," and we need to update a seconds counter. • the program running on processor 2 is trying to perform an illegal operation code. • someone pulled the plug on the power supply, and the system will run out of power in 50 msec. • the disk has just read the character that passed under the read/write head, and it wants to store it in memory before the next one arrives. in what order should the operating system handle these requests?