Engineer A is a solo practitioner in private practice who performs engineering design services in a rural area. Engineer A recently established an internal process for using an electronic seal and signature protocol after finalizing engineering design documents. Electronic signatures and seals are permissible in the jurisdiction in which Engineer A practices. Thereafter, Engineer A is retained by Client B in a nearby rural community to perform engineering design services in connection with Client B, a private industrial building owner. Engineer A does not advise Client B in advance regarding Engineer A’s use of an electronic seal and signature. Unbeknownst to Engineer A, Client B does not have the necessary software to permit a valid exchange of the electronic information in a compatible manner to allow Engineer A’s signed and sealed documents to be transmitted to Client B. As a result, code official approval; financing; and construction are delayed, causing inconvenience and increased costs to Client B. What were Engineer A's ethical obligations under the circumstances?