1) In class, we discussed many interactive systems where a human sensor also acts as a responder. Give one example of one such interactive system. (1 point) 2) Briefly explain how Yerkes-Dodson Law can be exploited in user interface design to facilitate better human performance. (1 point) 3) What are visual landmarks (1 point)? Why do we use visual landmarks in user interfaces (1 point)? Include a screenshot of a commonly used desktop application and briefly explain how it uses visual landmarks (1 point)