Answer: Both clients and third parties.

**Explanation:** Standard IV(B), Additional Compensation Arrangements, mandates that members and candidates obtain employer permission before accepting any form of compensation or benefits from third parties for services rendered to the employer or that could conflict with the employer's interests. This includes both direct compensation from clients and indirect benefits from third parties. Therefore, the correct answer is **C**, as the requirement applies to compensation from both clients and third parties. *Ethical and Professional Standards* emphasize the application of the Code of Ethics and Standards of Professional Conduct in scenarios involving professional integrity.

Author: LeetQuiz Editorial Team