When James Dyson tried a Hoover vacuum cleaner and was disappointed with the results, it spurred him to create the Dyson lines of vacuums. He was clearly using the competition source from which stage of the new-product development process? As Dyson looks to devise a new approach to headphones, it is clearly going to go after risk-taking consumers who are willing to put up with product flaws so that they can be the first among their group of friends to have the product. Which adopter category does this describe in the rate-of-adoption curve?