(a)
A nomination of a guardian under this article may be made in the petition for the appointment of the guardian or at the hearing on the petition or in a writing signed either before or after the petition for the appointment of the guardian is filed.
(b)
The nomination of a guardian under this article is effective when made except that a writing nominating a guardian under this article may provide that the nomination becomes effective only upon the occurrence of such specified condition or conditions as are stated in the writing, including but not limited to such conditions as the subsequent legal incapacity or death of the person making the nomination.
(c)
Unless the writing making the nomination expressly otherwise provides, a nomination made under this article remains effective notwithstanding the subsequent legal incapacity or death of the person making the nomination.