Which of the following statements about feedback regulation of a metabolic pathway is correct?a. The enzyme that is regulated by feedback inhibition is usually the last enzyme in the metabolic pathway. b. The products of the pathway become the reactants for a different reaction, and thus products are unable to accumulate..c. The final product of a metabolicpathway is usually the compound that regulates the pathway d. The compound that regulates the pathway acts as a competitive inhibitor or a positive allosteric regulator.