Using C 12, H 1, O 16 and N 14, which of the following repeat-unit molar masses is/are correct? (One or more options may be correct.)

1. APGA, $-[\mathrm{O}-\mathrm{CH}{}_2-\mathrm{CO}]{}^{-}$: 58 g/mol
2. BPoly(3-hydroxybutanoate), $-[\mathrm{O}-\mathrm{CH}(\mathrm{CH}{}_3)-\mathrm{CH}{}_2-\mathrm{CO}]{}^{-}$: 86 g/mol
3. CNylon 2-nylon 6, $-[\mathrm{NH}-\mathrm{CH}{}_2-\mathrm{CO}-\mathrm{NH}-(\mathrm{CH}{}_2){}_5-\mathrm{CO}]{}^{-}$: 188 g/mol
4. DPLA, $-[\mathrm{O}-\mathrm{CH}(\mathrm{CH}{}_3)-\mathrm{CO}]{}^{-}$: 72 g/mol