B) Perform enhanced due diligence on the seller and buyer and update client records with findings

A) Update the national art registry with the sale price of the art work so that art-based money laundering can be detected.

C) Review procedures for accepting commission sales and determining the buyer's source of funds on a best effort basis

D) Commission an external investigator to perform enhanced due diligence on the buyer. Enhanced due diligence is necessary to identify potential risks associated with high-value transactions such as art sales, a known method for money laundering. CAMS-Audit guidelines recommend updating client records with findings to maintain transparency and prepare for regulatory scrutiny. This approach ensures compliance with due diligence requirements and mitigates reputational and financial crime risks.