Explanation:

As per the Election commission of India, citizens are eligible to become voters under the following conditions:

• Every citizen who is 18 years old on the qualifying date (January 1 of the year in case) unless disqualified, is eligible to be enrolled. Hence option 1st is correct.
• Enrollment only at ordinary place of residence.
• Enrollment only at one place.
• Overseas Indian deemed to be ordinarily resident at the address given in passport.
• Service voters deemed to be ordinarily resident at their home address.