Letters of guardianship.

Letters of guardianship shall be issued to the guardian and shall specify whether the guardianship pertains to the person, or the property, or both, of the ward. The letters must state whether the guardianship is plenary or limited, and, if limited, the letters must state the powers and duties of the guardian. The letters shall state whether or not and to what extent the guardian is authorized to act on behalf of the ward with regard to any advance directive previously executed by the ward.