Explanation:

- Option 1: Judgments relating to matters of public nature are declared relevant, whether between the same parties or not.

- Section 42 allows judgments related to public matters to be relevant, regardless of whether they involve the same parties.

- Option 2: It forms an exception to the general rule that no one shall be affected or prejudiced by a judgment to which he is not party or privy.

- This section acts as an exception, allowing certain judgments to impact others even if they weren’t originally parties to it.

- Option 3: It admits as evidence all judgment inter partes would operate as res judicata in a second.

- Judgments operating as res judicata can be considered under this section, impacting later cases.

- Option 4: All of them.

- All of the above statements are true for Section 42 of the Indian Evidence Act, which allows these specific exceptions pertaining to judgments on matters of public nature.