Which of the following could revoke a DNRO?

Revocation of a Do Not Resuscitate Order (DNRO) can officially occur through the physical destruction of the document. This act signifies the individual's intent to revoke the order, thereby rendering it void. The physical destruction sends a clear message that the previous directive is no longer valid, indicating a change in the patient's wishes regarding resuscitation efforts.

While other options may involve communication or agreement regarding a DNRO, they do not carry the same legal weight. Physical destruction of the document directly removes the DNRO as an active order, highlighting the importance of clear and definitive actions in matters of medical directives.