(a) the production data for producers who participate in the MILCX Program shall be the production information provided to the department by the United States Department of Agriculture's Farm Service Agency (FSA) as requested by the department pursuant to such subdivision; provided, however, if the required data is not available from the FSA, the data may be obtained from the producers' milk cooperative, processor or handler. In the event production data is not available from any of the foregoing sources, the data shall be obtained directly from producers in accordance with subdivision (b) of this section;

(b) the production data for producers who do not participate in the MILCX Program shall be milk marketing payment stubs, bulk tank records, milk handler records, daily milk marketing records and such other evidence of monthly milk marketing as the commissioner may deem acceptable.