Which of the following is correct IUPAC name ?

Which of the following has correct IUPAC name ?

Which of the following is a correct IUPAC name for the compound shown? (CH_(3)CH_(2))_(2) overset(COOH)(overset(|)C CH_(2))CH(CH_(2)CH_(3))_(2)

Which among the following is correct IUPAC name ?

Which of the following is the correct IUPAC name?

Which of the following is not correct IUPAC name

Which of the following is the correct IUPAC name ?