Why sucrose is non-reducing sugar?

Question

Why sucrose is non-reducing sugar?

Answer 1

sucrose has a anomeric carbon which is not free since the carbon links glucose and fructose and fructose dosent have free OH group to under reducing reaction and to open the ring so sucrose is non reducing.
In the formation of sucrose ,1,2glycosidic bond is formed between glucose and fructose. In the process, the keto group on Carbon-2 of the fructose molecule and the aldehyde group on Carbon 1 of the glucose molecule are altered. Know that keto group and aldehyde group give a monosaccharides and disaccharides the reducing properties.