Typically, at the completion of a device i/o, a single interrupt is raised and appropriately handled by the host processor. in certain settings, however, the code that is to be executed at the completion of the i/o can be broken into two separate pieces. the first piece executes immediately after the i/o completes and schedules a second piece of code (sometimes called a "deferred procedure call") to be executed at a later time. what is the purpose of using this strategy in the design of interrupt handlers?