Final answer:
APS ethical guidelines assert the importance of supervision for psychologists' professional development, necessitating feedback and guidance, and rejecting the notion of it being optional for experienced professionals.
Step-by-step explanation:
The APS ethical guidelines highly prioritize the role of supervision in the professional development of psychologists. Supervision is not regarded as optional but as an integral part of psychology practice, especially for those seeking growth and adherence to ethical standards. Ensuring supervision is considered necessary for the ongoing professional development of psychologists at all levels of experience. This involves receiving feedback and guidance, which contrasts with options that suggest avoiding feedback (c) or relying solely on personal judgment without external input (d).