Except as provided in subsection (b) of this section, a supporter may be any person chosen by the adult. The following individuals are disqualified from acting as a supporter: A minor; An individual against whom the adult has obtained a peace order or a protective order; An individual who has been convicted of financial exploitation under Title 13, Subtitle 6 of this article; and An individual who is the subject of a civil or criminal order prohibiting contact with the adult. A supporter may resign as a supporter by written or oral notice to the adult, any remaining supporters of the adult named in the agreement, and any third parties who have the agreement on file. If a supporter resigns, dies, becomes incapable, or becomes for any other reason unable to act as a supporter and there is no alternate supporter, the authority given to the supporter is suspended.