How Is Diabetic Renal Protection Affected by ACE Medications? Diabetes

How is diabetic renal protection affected by ACE medications? Diabetes mellitus patients:

A) Have a reduced rate of renal progression, but ACE medications still need to be discontinued when advanced renal issues are present
B) Who start these medications never progress to renal nephropathy
C) Who have early renal dysfunction will see it reverse when on ACE medications
D) Without renal issues are the only ones who benefit from ACE protection