Explanation:

- Option 1: Be not conclusive

- When a foreign judgment is not pronounced by a court of competent jurisdiction, it is generally not considered conclusive. Courts require judgments to be made by properly authorized authorities to ensure fairness and jurisdictional propriety.

- Option 2: Be conclusive

- A judgment can only be deemed conclusive if it is given by a competent court and meets certain legal criteria. Otherwise, it won't be recognized as conclusive.

- Option 3: Based upon fraud

- While fraud can affect the conclusiveness of a judgment, it is a separate issue from the competence of jurisdiction.

- Option 4: None of the above

- This option is not applicable as the correct answer is outlined above.