Which One of the Following Coupled-Enzyme Glucose Methods Requires Extended $\alpha$

Which one of the following coupled-enzyme glucose methods requires extended incubation time to allow for the spontaneous conversion of the $\alpha$ -form of glucose to the $\beta$ -form so that both forms can react with the initial enzyme in the reaction?

A) Hexokinase method
B) Glucose oxidase method
C) Self-monitoring method
D) Polarographic method