Tendering and bidding is free trade between buyers and sellers in order to close a certain commodity. In the construction industry, it refers to a way for the contracting unit (owner) to reach a construction agreement through selection and comparison for the construction of a project and the contracting unit. What does this passage mainly support? ['What is a tender?', 'What are the forms of bidding?', 'What is tendering in the construction industry.', 'Tendering procedures.']