The foundational concept here relates to the specific legal authority granted to a Hearing Officer. The correct answer is 'The Scheduled laws' because the powers and jurisdiction of a Hearing Officer, including the ability to call records, are precisely defined and limited by the specific statutes or 'scheduled laws' under which they operate. These laws delineate the scope of their authority.
'The Constitution of Pakistan' is too broad; while it's the supreme law, it doesn't detail the operational powers of a Hearing Officer to call specific departmental records.
'The Penal Code' deals with criminal offenses and procedures, not the administrative power to summon records in a general hearing.
'Any international treaty' is irrelevant as international treaties govern relations between states and do not directly confer domestic administrative powers.