The correct answer is D. All of the above.
A systems investigation may be initiated by a manager’s formal request, a scheduled system’s review, or an analyst’s investigation.
A manager may request a systems investigation if they are concerned about the performance of a system or if they believe that the system is not meeting the needs of the organization.
A scheduled system’s review is a periodic assessment of a system to ensure that it is still meeting the needs of the organization.
An analyst’s investigation is an in-depth study of a system to identify problems and recommend solutions.
Systems investigations can be time-consuming and expensive, so it is important to ensure that they are only initiated when necessary.