Apointment of auditor u/s 139(1)

The appointment of auditors shall be made  for a 5 year term subject to ratification at every AGM. 

According to my view, Ratification does not require filing of ADT-1 

Section 139(1) appointment includes re-appointment therefore the documentation & filing of form is also required at the time of re-appointment but Ratification does not require filing of ADT-1 but it will be a better practice if certificate of disqualification is obtained even in case of ratification.

Thank you for your replies.

If the appointment has been made otherwise than for 5 years, the appointment is void/voidable ?

Prima facie, it is contravening section 139.