What is the correct structural formula for 4-bromo-3-methylhex-3-enoic acid?
CH3CH2CH(Br)C(CH3)=CHCOOH\text{CH}_3\text{CH}_2\text{CH}(\text{Br})\text{C}(\text{CH}_3)=\text{CHCOOH}CH3CH2CH(Br)C(CH3)=CHCOOH
CH3CH2C(Br)=C(CH3)CH2COOH\text{CH}_3\text{CH}_2\text{C}(\text{Br})=\text{C}(\text{CH}_3)\text{CH}_2\text{COOH}CH3CH2C(Br)=C(CH3)CH2COOH
CH3CH2CH=C(CH3)CH(Br)COOH\text{CH}_3\text{CH}_2\text{CH}=\text{C}(\text{CH}_3)\text{CH}(\text{Br})\text{COOH}CH3CH2CH=C(CH3)CH(Br)COOH
CH3CH(Br)CH=C(CH3)CH2COOH\text{CH}_3\text{CH}(\text{Br})\text{CH}=\text{C}(\text{CH}_3)\text{CH}_2\text{COOH}CH3CH(Br)CH=C(CH3)CH2COOH