Which of the Following Pairs Is Interconverted in the Process $\alpha$

Multiple Choice

Which of the following pairs is interconverted in the process of mutarotation?

A) d-glucose and d-fructose
B) d-glucose and d-galactose
C) d-glucose and d-glucosamine
D) d-glucose and l-glucose
E) ( $\alpha$ -d-glucose and $\beta$ -d-glucose)