Determine if galactobiose is a reducing sugar. Explain your answer.

Galactobiose is a reducing sugar because one of its galactose units has a free anomeric carbon that can act as a reducing agent.

Galactobiose is a reducing sugar because both of its galactose units have free hydroxyl groups that can participate in redox reactions.

Galactobiose is not a reducing sugar because both of its galactose units are linked by an α(1→4) glycosidic bond, which prevents any free anomeric carbons.

Galactobiose is not a reducing sugar because it does not contain any glucose molecules necessary for reducing activity.