The contracting authority may either:

1. (a)

   require the concessionaire to award contracts representing a minimum of 30 % of the total value of the work for which the concession contract is to be awarded, to third parties, at the same time providing the option for candidates to increase this percentage, this minimum percentage being specified in the concession contract, or

2. (b)

   request the candidates for concession contracts to specify in their tenders the percentage, if any, of the total value of the work for which the concession contract is to be awarded which they intend to assign to third parties.