Which of the following is NOT a requirement for temporary certificates of ownership?

The requirement for a temporary certificate of ownership includes essential details to ensure that the document is valid and provides necessary information for both the dealer and the purchaser. The inclusion of the date of issuance ensures that the temporary certificate is time-stamped, making it clear when the ownership was granted. The name and address of the purchaser are crucial for identifying the new owner of the vehicle, and the temporary plate number is vital for vehicle registration and identification purposes during the interim period before the permanent plates are issued.

The signature of the dealer, while common practice for many dealership documents, is not listed as a strict requirement in the context of temporary certificates of ownership. This is why it stands out as the correct answer in this scenario.