A 15% increase in the number of customers who say they're satisfied with the call is considered equal in value to a 10% decrease in call duration at the current satisfaction level. Which of the following would necessarily be considered preferable to either of these states? A 14% increase in customer satisfaction or a 12% increase in call duration A 7.5% increase in customer satisfaction or a 5% decrease in call duration A 13% increase in customer satisfaction A 16% increase in customer satisfaction and no increase in in call duration