Among the various changes introduced by the Bharatiya Nyaya Sanhita, 2023, which of the following represents a significant addition that was not explicitly defined in the erstwhile Indian Penal Code (IPC)?

1. AIt decriminalizes adultery.
2. BIt introduces capital punishment for mob lynching.
3. CIt abolishes the offence of sedition entirely.
4. DIt provides a specific definition for the offence of 'terrorism'.