Thinking back to the lessons your company learned from its experiences with its legacy information systems during the Y2K dilemma, you finally convinced management to consider systems maintenance from the beginning of the project. However, regardless of what design considerations are factored into the project, maintenance should ( )。 A thinks maintenance always be included as an activity to be performed during the closeout phase B insists that maintenance has a separate phase in the life cycle for information systems projects because 60% t0 70% 0f computer systems' life cycle costs generally are devoted to maintenance C asserts maintenance is not be viewed as part of the project life cycle D affirms maintenance should be viewed as a separate project