(d) The recipient’s functioning ranks shall be as follows:
(1) Rank one. A recipient’s functioning shall be classified as rank one if his or her functioning is independent, and he or she is able to perform the function without human assistance, although the recipient may have difficulty in performing the function, but the completion of the function, with or without a device or mobility aid, poses no substantial risk to his or her safety.
(2) Rank two. A recipient’s functioning shall be classified as rank two if he or she is able to perform a function, but needs verbal assistance, such as reminding, guidance, or encouragement.
(3) Rank three. A recipient’s functioning shall be classified as rank three if he or she can perform the function with some human assistance, including, but not limited to, direct physical assistance from a provider.
(4) Rank four. A recipient’s functioning shall be classified as rank four if he or she can perform a function, but only with substantial human assistance.
(5) Rank five. A recipient’s functioning shall be classified as rank five if he or she cannot perform the function, with or without human assistance.