What Mechanism Is Used to Control Whether HMG-CoA Is Used

What mechanism is used to control whether HMG-CoA is used for ketone body synthesis or for cholesterol synthesis?

A) control of HMG-CoA lyase versus HMG-CoA reductase
B) control of NADPH versus acetyl-CoA levels
C) control of NADPH:NAD⁺ levels
D) depletion of products influences where HMG-CoA will be shunted
E) ketone bodies are synthesized in the mitochondria; cholesterol is synthesized in the cytoplasm