Which of the following is a common method used in bid manipulation schemes?

• A. Extending bid opening dates without justification
• B. Opening bids prematurely
• C. Altering bids
• D. All of the above

Answer: (D)

Bid manipulation schemes aim to distort the bidding process by controlling timing and the bid content. Extending bid opening dates without justification disrupts the schedule and can create opportunities for improper coordination or pressure tactics. Opening bids prematurely lets insiders see bids before the official opening, which can undermine fairness and enable collusion or manipulation. Altering bids directly changes what was submitted, fraudulently altering prices or terms. Each of these tactics has been observed in manipulation schemes, so choosing all of the above reflects the full range of common methods used.