What methods have been mentioned in the Minimum Wages Act, 1948 for fixation and revision of minimum wages ?

Section 5 of Minimum Wages Act- Procedure for fixing and revising minimum wages .—(1) In fixing minimum rates of wages in respect of any scheduled employment for the first time under this Act or in revising minimum rates of wages so fixed, the appropriate Government shall either— (a) appoint as many committees and sub-committees as it considers necessary to hold enquiries and advise it in respect of such fixation or revision, as the case may be, or (b) by notification in the Official Gazette, publish its proposals for the information of persons  likely to be affected thereby and specify a date, not less than two months from the date of the  notification, on which the proposals will be taken into consideration