What does USPAP traditionally prohibit appraisers from doing?

The correct choice emphasizes that USPAP prohibits appraisers from performing assignments with bias. This principle is fundamental to maintaining the integrity and objectivity of the appraisal process. Bias can manifest in various forms, such as personal opinions, preferences, or external influences that could skew the valuation of a property. By prohibiting bias, USPAP ensures that appraisers provide fair and impartial assessments that reflect the true value of a property based on factual data and market conditions rather than subjective influences. This standard is critical for fostering trust in the appraisal profession, as clients and stakeholders rely on appraisals to make informed decisions.

The other options, while touching on aspects of appraisal practice, do not reflect the core prohibitions outlined by USPAP. For instance, saving appraisal data for future use can be a practical aspect of an appraiser's workflow, as long as it complies with confidentiality and data protection standards. Working in multiple states is permissible as long as the appraiser is qualified and complies with the respective regulations in each state. Similarly, using automated valuation models can be acceptable within certain guidelines, given that they are applied correctly and ethically.