For each of the following questions, select a research technique that is likely to yield a useful answer. for instance, if the question is "which companies within a 20-mile radius of our company headquarters sell recycled paper? " a search of the web is likely to provide a useful answer. does the honda cr-v include traction control as a standard feature? how much money has our company’s philanthropic foundation donated to colleges and universities in each of the last three years? how does a 3d printer work? could our building 3 support a rooftop green space? how can we determine whether we would save more money by switching to led lighting in our corporate offices?