Phillip Witt, president of Witt Input Devices, wishes to create a portfolio of local suppliers for his new line of keyboards. As the suppliers all reside in a locution prone to hurricanes, tornadoes, flooding, and earthquakes. Phillip believes that the probability in any year of a "super-event" that might shut down all suppliers at the same time for at least 2 weeks is 3%. Such a total shutdown would cost the company approximately S400.000. He estimates the "unique-event" risk for any of the suppliers to be 5%. Assuming that the marginal cost of managing an additional supplier is $ 15,000 per I year, how many suppliers should Witt Input Devices use? Assume that up to three nearly identical local suppliers are available..