What must an appraiser do after providing an oral report of a real property appraisal assignment?

The requirement for appraisers after delivering an oral report is to add a signed and dated certification to their appraisal workfile. This step is crucial because it formalizes the appraisal process and ensures compliance with professional standards. The certification serves as a record that attests to the appraiser's qualifications and the adherence to the Uniform Standards of Professional Appraisal Practice (USPAP).

This documentation in the workfile is important for accountability and transparency, allowing for verification of the appraisal process and findings if questioned later. Furthermore, it reinforces the importance of maintaining comprehensive records of appraisal assignments, which is a key aspect of professional practice in real estate appraisal.

In contrast, the other options do not align with the established requirements. Signing and certifying an oral report immediately would not provide the necessary formal documentation required by USPAP. Sending a written certification statement to the client, while a good practice, does not address the immediate need to update the workfile and could lead to gaps in record-keeping. Filing the oral report without further certification fails to meet the standards for proper documentation in appraisal practice, thus weakening the integrity of the appraisal.