All Aerospace Company has been asked to provide a Rough Oder of Magnitude (ROM) cost estimate for new training aircraft, so the expert Opinion method to derive the ROM. Two years later, the customer releases a request for Proposal (RFP) for a new training aircraft. The All Aerospace Company decides to bid on the effort-they have 30 days to respond to the RFP. Which cost estimating technique should they used? A) Analog; B) Comparison; C) Parametric; D) Expert Opinion