Final answer:
The ideal educational background for a Certified Information Systems Auditor is a degree that combines accounting and information systems study, providing a mix of both IT and financial auditing knowledge.
Step-by-step explanation:
The best educational background for a Certified Information Systems Auditor (CISA) would likely be b) A degree which combines the study of accounting with the study of information systems. This combination provides a strong foundation in both the technical aspects of information systems and the principles of accounting, which are essential for auditing the controls and processes within an organization's IT systems. Additionally, a degree in information systems or technology could also be highly beneficial, providing in-depth technical knowledge that's crucial for the role.
While work experience in information systems is invaluable and could substitute formal education in some cases, the certified status typically requires a blend of education, experience, and the completion of the CISA examination. An accounting degree alone may not cover the breadth of IT-specific knowledge needed, but it is certainly useful for the financial auditing aspects of the role.