The structural isomers of $\text{C}_3\text{H}_6\text{O}_3$ shown below are: $\text{HOCH}_2\text{COCH}_2\text{OH}$ $\text{HOCH}_2\text{CH(OH)CHO}$ $\text{HOCH}_2\text{CH}_2\text{CO}_2\text{H}$ $\text{CH}_3\text{CH(OH)CO}_2\text{H}$ Which of the following statements about these structural isomers are correct?
- A1, 2 and 3 are correct
- B1 and 2 only are correct
- C2 and 3 only are correct
- D1 only is correct