D-Glucose and D-mannose are:

Step-by-step solution

D-Glucose and D-mannose are stereoisomers that differ in configuration at only one chiral center, specifically at the C-2 carbon atom. Such isomers are called epimers. Since they are stereoisomers that are not mirror images of each other, they also fall under the category of diastereomers. Therefore, D-glucose and D-mannose are both epimers and diastereomers. Answer: Both epimers and diastereomers