The IUPAC name of the compound

(1) 3-amino-4-chloro-2-methylpent-2-enoic acid
(2) 2 -methyl-3-amino-4-chloro-2-pentenoic acid
(3) 1 -hydroxy-1-oxo-2-methyl-3-amino-4-chloro-2- pentene
(4) 3-amino-2,4-dimethyl-4-chloro-2-butenoic acid