Final answer:
A notary completes a confidential marriage by serving as an official witness and acknowledging a legally binding marriage agreement while ensuring the parties' identities remain confidential.
Step-by-step explanation:
When a notary completes a confidential marriage, the notary act that will be performed is typically serving as an official witness to the consent of the marriage and providing an acknowledgment that a legally binding marriage agreement has been established. Notaries public are authorized to perform certain acts in legal affairs, such as witnessing signatures on documents. In the case of a confidential marriage, the notarial role may also involve ensuring that the identities of the parties are kept confidential and that the marriage license is processed according to state laws, which often require such marriages to be available only to the parties involved in the marriage and not to the general public. It is essential to understand that the specific duties and actions taken by a notary in these instances can vary by jurisdiction based on local laws regarding confidential marriages.