When selecting an external service provider, the CAE must ensure that the provider possesses the necessary knowledge, skills, and competencies relevant to the specific type of work being reviewed. This is best demonstrated by the provider's experience in the relevant field (Option D). The other options, such as financial interest (Option A), prior relationships (Option B), and compensation (Option C), are considerations for assessing potential conflicts of interest or independence but are not primary criteria for evaluating technical competency.
IIA Standard 1210: Proficiency.
IIA Practice Guide on External Service Provider Arrangements.

Detective controls are designed to identify and detect errors or fraud after they have occurred. Receipts for employee expenses serve as a detective control by providing evidence of transactions, enabling verification and review of expenses to identify any fraudulent or unauthorized activities. Awareness of prior incidents of fraud (Option A) is more of a preventive control, contractor non-disclosure agreements (Option B) are preventive controls to mitigate risks of information leakage, and verification of currency exchange rates (Option C) is more of a transaction control. References: IIA Glossary - Detective Controls, COSO Framework

Section: Volume E