An appraiser is not permitted to be which of the following when performing an appraisal?

When performing an appraisal, an appraiser must remain impartial and objective to ensure the integrity of their work. Being an advocate means promoting a particular interest or outcome, which compromises the appraiser's independence and objectivity. This role can lead to biased opinions and influence the results, creating a conflict of interest that undermines the credibility of the appraisal.

In contrast, roles like a critic, observer, or consultant can all be performed without jeopardizing the objectivity required in an appraisal. A critic may assess the appraisal for its quality and adherence to standards without engaging in advocacy. An observer can simply witness the process or findings without taking a side, and a consultant can provide guidance and insights while maintaining their professional integrity. However, the core role of an appraiser is to provide an unbiased valuation based on data and analysis, making the role of an advocate incompatible with the appraisal process.