Considering a typical IBM-compatible personal computer, you are required to:

(a) Identify the main components of a personal computer system. For each item identified, provide a brief description of its purpose.

(b) Using relevant examples, describe some of the methods that can be used to assess the performance and quality of key components.

(c) In addition to the initial cost of the personal computer itself, a number of other expenses are likely to be incurred. Using relevant examples, provide an overview of these additional costs.