Under section 3 of the Registration Act, 1908, which authority appoints an Inspector-General of Registration?

Under section 3(1) of the Registration Act, 1908, the State Government appoints an officer to be the Inspector-General of Registration for the territories subject to it. Registration is administered by each State, so the Central Government does not make this appointment, and neither the High Court nor the Registrar General of India, who deals with the census and the registration of births and deaths, has any role under section 3.