An IS auditor conducting a review of software usage and licensing discovers that numerous PCs contain unauthorized software. Which of the following actions should the IS auditor take? 
A、Personally delete all copies of the unauthorized software. 
B、Inform the auditee of the unauthorized software, and follow up to confirm deletion. 
C、Report the use of the unauthorized software and the need to prevent recurrence to auditee management. 
D、Take no action, as it is a commonly accepted practice and operations management is responsible for monitoring such use.