law: Companies Act, 2013 
  138.
  
    Internal
  
  audit.
  1.      Such class or classes
  
  of companies as may be prescribed shall be required to appoint an internal
  
  auditor, who shall either be a chartered accountant or a cost accountant, or
  
  such other professional as may be decided by the Board to conduct internal
  
  audit of the functions and activities of the company.
  2.      The Central
  
  Government may, by rules, prescribe the manner and the intervals in which the
  
  internal audit shall be conducted and reported to the Board.