(a) Notice to a person with authority to represent and bind another person under this code or a first trust instrument has the same effect as notice given directly to the person represented.
(b) Consent of or waiver by a person with authority to represent and bind another person under this code or a first trust instrument is binding on the person represented unless the person represented objects to the representation before the consent or waiver otherwise would become effective.
(c) A person with authority to represent and bind another person under this code or a first trust instrument may file an application under Section 19509 on behalf of the person represented.
(d) A settlor may not represent or bind a beneficiary under this part.