(1) In making procurement by bidding, an invitation to bid can be made by the following process:-
(a) Inviting open bids by determining prequalification,
(b) Inviting open bids without determining prequalification.
(2) The open bid may be invited in a single stage or in two stages.
(3) In making invitation to bid on the conditions set forth in Sub-section
(1) of Section 28, it may be made in two stages.