40. A competitive inhibitor of a glucose transporter is added, and extracellular glucose is increased tenfold. Which conclusions are most consistent with classical transport kinetics? (1) Maximal transport rate can be restored at sufficiently high glucose concentration. (2) Transport affinity for glucose is effectively reduced. (3) Transporter cycling between conformations is permanently impaired. (A) (1) only. (B) (2) only. (C) (1) and (2). (D) (2) and (3). (E) (1) and (3).