Elevated plasma glucose concentrations are associated with which of the following events in pancreatic beta cells?

a) increased rate of glycolysis and the citric acid cycle

b) opening of K_ATP channels

c) influx of Ca²⁺

d) increased ATP production

e) hyperpolarization

f) closing of voltage-gated Ca²⁺ channels

g) decreased efflux of K+

h) closing of K_ATP channels

i) depolarization