Penny works in the telephone sales department of the energy efficient window company. she uses a random digit dialing technique to contact potential customers. once she has a potential customer on the phone, she invites them to complete a brief survey about energy efficient windows. for example, she asks consumers: “do you agree that replacing your old windows with an energy efficient window system could reduce your monthly heating/cooling bill? ” at the end of the survey, penny says, “it sounds like you could benefit from a new set of energy efficient windows. i can tell you about some exciting discounts that we're currently offering through our company. if not now, when would be a good time to call back? ” this is a good example of: