A CPA is engaged to audit the financial statements of a nonissuer. During the audit, the CPA encounters a complex valuation issue involving a derivative. The CPA decides to use an auditor's specialist. To maintain the appropriate level of professional skepticism, the CPA should:

Accept the specialist's findings as audit evidence without further evaluation, provided the specialist is qualified.

Evaluate the adequacy of the specialist's work, including the relevance and reasonableness of the specialist's findings or conclusions.

Require the specialist to provide a separate opinion on the derivative valuation to be attached to the audit report.

Perform the valuation independently to verify the specialist's results.