With reference to the acquisition of citizenship under the Citizenship Act of 1955, consider the following statements:

1. The children of foreign diplomats posted in India can acquire Indian citizenship by birth

2. If any foreign territory becomes a part of India, all the residents of the territory automatically become the citizens of India

3. A citizen of another country who was a citizen of India at any time after the commencement of the Constitution is eligible to become an OCI cardholder.

4. When a person renounces his Indian citizenship, every minor child of that person also loses Indian citizenship

Which of the statement/s given above is/are correct?