The purchaser shall close an electronic auction in one or more of the following ways:
1° On the date and at the time fixed in the invitation to take part in the auction;
2° When it no longer receives any new prices or new values that meet the requirements concerning minimum differences, provided that it has previously specified the period that it will observe from receipt of the last bid before closing the auction;
3° When all the phases of the auction provided for in the invitation to take part in the auction have taken place.
Where the purchaser intends to close the auction in accordance with the provisions of 3°, where applicable in combination with the procedures laid down in 2°, the invitation to participate shall indicate the timetable for each phase of the auction.