The document that has been stamped or sealed indicates that a professional member

NPPE materials clearly state that the application of a professional stamp or seal signifies that the licensed professional has taken professional responsibility for the work. By stamping or sealing a document, the professional accepts responsibility for the technical content and confirms that it was prepared under their direct supervision or control and meets applicable standards.

The seal does not merely indicate review or supervision; it is a formal declaration of accountability. Options A, B, and D may be true in some cases, but they are not the defining meaning of a professional seal. The essential legal and professional significance is the acceptance of responsibility.