(a) A competent person who is interested in a hearing in a guardianship proceeding may waive notice of the hearing in writing either in person or through an attorney.
(b) A consul or other representative of a foreign government whose appearance has been entered as provided by law on behalf of a person residing in a foreign country may waive notice on the person's behalf.
(c) A person who submits to the jurisdiction of the court in a hearing is considered to have waived notice of the hearing.