Final answer:
The Supervisory Appraiser is responsible for determining if a Trainee Appraiser is competent to inspect a property unsupervised. The Trainee Appraiser cannot make this determination on their own, and the Appraisal Foundation or the appraisal client are not involved in this decision.
Step-by-step explanation:
The responsibility for determining whether a Trainee Appraiser is competent to inspect a property unsupervised lies with the Supervisory Appraiser. The Supervisory Appraiser is tasked with overseeing the trainee's work and ensuring that they meet the necessary standards of competency and adhere to professional appraisal practice. Although the Trainee Appraiser should strive for competence, it is not solely their responsibility to determine unsupervised work readiness.
The Appraisal Foundation, while providing guidelines and standards through the Uniform Standards of Professional Appraisal Practice (USPAP), does not make individual competence determinations. Moreover, the appraisal client does not have the authority to assess the trainee's competence for unsupervised property inspections.