Incorrect statements among the following.
A) Sucrose is reducing sugar
B) Two $\mathrm{\alpha }$ -D-glucose units in maltose are linked by 1,4-linkage
C) $\mathrm{\beta }$ -D-glucose and $\mathrm{\beta }$ -D-fructose units are linked by 1,4-linkage in lactose
D) All polysaccharides are reducing nonsugars