5. From perusal of the aforesaid Section, it is apparent that the provisions of the Act would apply in three different circumstances. Firstly, under Section 1 (3) (a), Section 1 (3) (b) and as per Section 1 (4) as above. The question with regard to the applicability of Section 3 (a) of the Act on the respondents has in the opinion of this Court become academic as the respondents have already started depositing provident fund and has by their action agreed of the application of the provisions of the Act in terms of Section 1 (4) as noticed above. Keeping in view that the respondents have already deposited provident fund amount in terms of Section 1 (4) of the Act of 1952, the provisions of Section 1 (5) of the Act would come into operation and even if number of persons employed by them reduces from 20, they will have to continue to be governed by the Act of 1952. Accordingly, the question decided by the Appellate Authority has become otiose and does not call for adjudication in view of the admitted position of the respondents depositing provident fund of their employees under the EPF Act, 1952.