To know the quality of service in the company you work for, they ask customers to rate the attention, service and value for money. For each of these three service attributes, customers rate from 1 to 10. The company then makes a metric that consists of taking the lowest of the three values. What should we tell the director of the company about that metric? Select one:
 a. The metric is appropriate because it expresses quality with a simple number that is easy to understand.
b. The metric is appropriate because by extracting the lowest value of the three it always tells us if we should improve.
c. The metrics are bad. We cannot obtain any information that will lead us to act