Which of the following must an inventor certify in an Oath/Declaration?

An inventor must certify that they acknowledge understanding the application's content in an Oath/Declaration. This requirement ensures that the inventor is aware of what they are claiming as their invention and can support the claims made in the application. This acknowledgment is crucial as it indicates that the inventor is taking responsibility for the content of the patent application, which is essential for the integrity of the patent system.

By confirming their understanding, the inventor demonstrates that they have reviewed the information, the claims being made, and the potential implications of the patent they are seeking. This is important not only for the inventor's own awareness but also for the patent office, which relies on this assertion to proceed with the examination process.

The other choices do not reflect required certifications in the Oath/Declaration as established by patent law. For instance, an inventor is not required to disclose whether they have filed a patent application in another jurisdiction or to promise that they will not amend the application after submission. Moreover, while discussing the invention with a legal advisor is advisable, it's not a prerequisite for the Oath/Declaration process.