Consider a word processor that performs the tasks of displaying a high resolution image, responding to user key strokes, and performing spell and grammar checking. Assuming that the word processor is implemented as a multi-threaded application on a single-processor system,

(i) what benefit would multi-threading yield from users point of view

(ii) which of the above three tasks are CPU bound and which are I/O bound

(iii) would multi-threading yield any benefit if all the tasks were CPU bound.