Explanation:

- Section 24 of the Evidence Act: Deals with confessions made due to inducement, threat, or promise and renders them inadmissible in court.

- Section 25 of the Evidence Act: Specifies that a confession to a police officer is not admissible in court.

- Section 26 of the Evidence Act: States that a confession made while in police custody is not admissible unless it's made in the presence of a magistrate.

- Section 27 of the Evidence Act: Provides a special provision where information leading to the discovery of evidence is admissible, even if it comes from a confession made in police custody.

Correct Answer: Option 4 - all the above.