Section 54(1)(c) in Andhra Pradesh Infrastructure Development Corporation Act, 1998
(c)where the person to be served is a statutory public body or a Corporation or a society or other body, if the document is addressed to the Secretary, Treasurer or other Principal Officer of that body, Corporation or society at its principal office, and is either,-(i)sent under certificates of posting or by registered post; or(ii)left at that office;