Enterohepatic circulation

Enterohepatic circulation is described by which one of the following pathways? (a) the conversion of pyruvate to lactate and lactate to pyruvate in the muscle (b) the conversion of glucose to lactate in muscle and the re-conversion of that lactate to glucose in liver (c) the reuptake of bile salts from the intestine to be re-used for bile /cholesterol synthesis (d) LDL-cholesterol uptake into liver by binding to LDL receptors and the recycling of those LDL receptors to the cell surface (e) The cycling of fructose-6-phosphate and fructose