Which of the following statements about the determinants of electoral behaviour in India are correct?

1. Charisma of political leaders significantly impacts rural but not urban voting patterns.
2. Caste remains a strong determinant in rural India but is gradually losing influence in urban areas.
3. Election campaigns serve primarily to solidify already decided voter bases rather than sway undecided voters.
4. The "money factor" plays a significant role, especially during wave elections.