Which was not a lesson learned from the Wright Brothers Requirements Definition Exercise?

Sometimes the customer may not be able to accurately explain what they are asking for

The minimum speed was the basis on which the contract payment would be made, and therefore how the speed was measured is critically important

Providing the Chief Signal Officer the ability to change requirements during test is a good objective requirement

It is important to understand the meaning of the requirements in the Request For Proposal

Sometimes requirements are conflicting and unclear