Which forms a polymer with HOOC(CH2)4COOH\text{HOOC}(\text{CH}_2)_4\text{COOH}HOOC(CH2)4COOH?
CH3CH2NH2\text{CH}_3\text{CH}_2\text{NH}_2CH3CH2NH2
H2N(CH2)6NH2\text{H}_2\text{N}(\text{CH}_2)_6\text{NH}_2H2N(CH2)6NH2
CH3COOH\text{CH}_3\text{COOH}CH3COOH
CH3CH2OH\text{CH}_3\text{CH}_2\text{OH}CH3CH2OH