Enzyme labeling can be used to map the structure of the active site of an enzyme using an affinity label, a molecule that is structurally similar to the substrate. Which of the following statements about enzyme labeling is true?a.) the affinity label dissociates quickly from the regenerated enzymeb.) labeling is an example of noncompetitive inhibitionc.) labeling relies upon only noncovalent intermolecular forcesd.) labeling reduces Km and increases Vmaxe.) labeling involes covaletn modification of the enzyme