Three procurement methods include: (a) Competitive proposals, contracting by negotiation, and sealed bidding (b) Contracting by negotiation, formal advertising, and sealed bidding (c) Contracting by...

Three procurement methods include:
(a) Competitive proposals, contracting by negotiation, and sealed bidding
(b) Contracting by negotiation, formal advertising, and sealed bidding
(c) Contracting by negotiation, competitive proposals, and change proposals
(d) Competitive proposals, other than competitive procedures, and sealed
bidding
(e) Competitive proposals, two-step procurement, and multiyear procurement