Statement-I: Carbohydrates having D-configuration are always dextrorotatory.
Statement-II: D-(+)-glucose and L-(-)-glucose are a pair of enantiomers.

Carbohydrates having D-configuration can be dextro rotatory or laevo rotatory;

Ex-D-(+)-glucose, D-(-)-galactose;

Mirror image of D-(+)-glucose will be L-(-)-glucose…they are a pair of enantiomers.