A long-term IS employee with a strong technical background and broad managerial experience has applied for a vacant position in the IS audit department. Determining whether to hire this individual for this position should be based on the individual's experience and: 
A、length of service, since this will help ensure technical competence. 
B、age, as training in audit techniques may be impractical. 
C、IS knowledge, since this will bring enhanced credibility to the audit function. 
D、ability, as an IS auditor, to be independent of existing IS relationships.