What does a certificate of fax transmission confirm?

A certificate of fax transmission serves to confirm that a fax has been sent successfully. This document is generated by the fax machine or service that transmits the message and provides proof of the transmission, including details such as the time, date, and the number to which the fax was sent.

In the context of trademark applications or correspondence with the USPTO, this confirmation is important as it provides evidence that communications were sent to the appropriate party, which can be critical in legal matters or when ensuring compliance with deadlines.

The other choices do not accurately reflect the purpose or function of a certificate of fax transmission. For instance, an official registration of a trademark is documented through a certificate of registration issued by the USPTO, while duplicating an application or acknowledging a cease and desist notice would require different forms of documentation and communication. Therefore, the correct answer is the confirmation of successful transmission provided by the certificate of fax transmission.