Which of the following is true with respect to ACE inhibitors and diabetic nephropathy?
A. These drugs lower glomerular filtration pressure, protecting from further kidney damage in those who have established nephropathy
B. These drugs have been shown to be protective against the development of diabetic nephropathy and should be used prophylactically
C. In diabetic patients with no signs of early kidney disease, these drugs prevent microalbuminuria
D. Enalaprilat is the only ACE inhibitor approved for the treatment of diabetic nephropathy