6. Below are the structures of four D-aldohexoses. Three of these carbohydrates are epimers of the forth. Circle the aldohexose that is epimeric to the other three structures and below the other three structures indicate whether they are epimeric to the forth structure at carbon 2, carbon 3, or carbon 4. H- H H OH OH OH OH D-Altrose "H H H -OH H- OH OH D-Mannose - H- -H H -H OH SOH D-Tallose: H H H- OH H -OH OH "OH D-Glucose