Select all the correct statements about phenol-formaldehyde polymers.

1. ABakelite softens on heating and can be remoulded repeatedly
2. BThe chain of bakelite contains ester linkages that are cleaved by water
3. CNovolac is converted into bakelite by heating with a formaldehyde source such as hexamethylenetetramine
4. DResole is formed with excess formaldehyde under basic catalysis and contains hydroxymethyl groups