The α and β forms of D-glucopyranose are:

The correct answer is Option (3) → Anomers

NCERT (2026-27 edition):
10.1.2.1 Glucose – “… The two cyclic hemiacetal forms of glucose differ only in the configuration of the hydroxyl group at C1, called anomeric carbon (the aldehyde carbon before cyclisation). Such isomers, i.e., α-form and β-form, are called anomers. The six membered cyclic structure of glucose is called pyranose structure (α– or β–), in analogy with pyran.”