Which of the following statements are FALSE about cost reimbursable contracts?

cost-reimbursable contracts generally carry the highest risks to the buyer, as the total costs are uncertain

cost-reimbursable contracts often includes incentives for meeting or exceeding project objectives

cost-reimbursable contracts resemble fix unit agreements when the unit rates are preset by the buyer and seller

cost-reimbursable contracts are contracts that involves payments to the seller for actual costs, plus a fee representing the sellers profit