Explanation:

All statements are incorrect.

• The Election Commission of India is responsible for conducting elections to the respective state legislatures.
• The state election commissions are responsible for conducting elections to the municipalities and panchayats within the state.
• The NRIs are allowed to vote in the parliamentary elections only when they are physically present in their voting constituency.
• Service voters in India are allowed to vote through proxy or postal ballots.

Hence option 4th is correct.