5. At the date of commencement of this Constitution, every person-

(a) who, or either of whose parents, or any of whose grandparents was born in the territories included on that date within the Federation, or

(b) who on that date has his domicile in those territories,

shall be a citizen of the Federation:

Provided that where any such person is a citizen of another State, he may, in accordance with the provisions made in that behalf by any Federal law, elect not to accept the citizenship conferred by this section.

Explanation: A person shall, for the purposes of this section, be deemed to have his domicile in any territory if he has a domicile therein within the meaning of Part II of the Indian Succession Act, 1925:

Provided that notwithstanding anything contained in section 11 of the said Act, a person shall, for the purposes of this section, be deemed to have acquired a domicile in the territories included within the Federation if–

(a) before the date of commencement of this Constitution he has made and deposited in some office within those territories appointed for the purpose by the Provincial Government a declaration in writing under his hand of his desire to acquire such domicile, and

(b) he has been resident within those territories for a period of less than one month immediately preceding the time of his making such declaration.