During the course of a new client audit, the audit firm uses an appraisal specialist to substantiate certain amounts reported on the financial statements. Assuming that the specialist's findings support the client's financial statements being in compliance with GAAP, the auditor would do which of the following when writing an unmodified opinion? Reference the scope and findings of the specialist in a detailed separate paragraph in the report. Reference the specialist in the audit report with prior permission from the specialist. Make no reference to the specialist in the audit report. Reference the specialist in the audit report without obtaining the specialist's permission