Lactose involves a glycosidic linkage between
C–1 of β-D-glucopyranose and C–4 of β-D-galactopyranose
C–1 of β-D-glucofuranose and C–4 of β-D-galactopyranose
C–1 of β-D-galactopyranose and C–4 of β-D-glucofuranose
C–1 of β-D- galactopyranose and C–4 of β-D-glucopyranose