What type of sales must all auctioneers provide a full account of?

All auctioneers are required to provide a full account of all sales, which includes both private and public auctions. This requirement ensures transparency and accountability in the auction process, allowing buyers and sellers to understand exactly what has occurred in the transaction. By maintaining comprehensive records of all sales, auctioneers uphold ethical standards and foster trust among participants in the auction market, regardless of the type of auction being conducted. This practice is essential for protecting the interests of clients and supporting regulatory compliance, as it enables oversight and proper auditing of auction transactions.

In contrast, focusing solely on specific types of auctions or sales, as suggested by the other choices, would leave gaps in accountability and could undermine the integrity of the profession. The comprehensive nature of this requirement emphasizes the importance of thoroughness and clarity in all auction activities.