An anomer is represented by: 

1.   
2. 
3.
4. 

HINT- Anomers have different configurations at C-1.

Explanation:

The stereoisomers which differ in the configuration at only one chiral carbon atom are known as epimers whereas those which differ in configuration at acetal or hemiacetal carbon are known as anomers.

If OH is present on the right side anomeric carbon is known as  - form and if O is present on the left side of anomeric carbon is known as  - form.