3. At the commencement of this Act every person shall be deemed to be a citizen of Bangladesh-(a) who or any of whose parents or grandparents was born in the territory now included in Bangladesh and who after the fourteenth day of August, 1947, has not been permanently resident in any country outside Bangladesh; or(b) who or any of whose parents or grandparents was born in the territories included in India on the thirty-first day of March, 1937, and who, except in the case of a person who was in the service of Bangladesh or of any Government or Administration in Bangladesh at the commencement of this Act, has or had his domicile within the meaning of Part II of the Succession Act, 1925, as in force at the commencement of this Act, in Bangladesh or in the territories now included in Bangladesh; or(c) who is a person naturalised as a British subject in Bangladesh; and who, if before the date of the commencement of this Act he has acquired the citizenship of any foreign State, has before that date renounced the same by depositing a declaration in writing to that effect with an authority appointed or empowered to receive it; or(d) who before the commencement of this Act migrated to the territories now included in Bangladesh from any territory in the Indo-Pakistan sub-continent outside those territories with the intension of residing permanently in those territories.