Which of the following is NOT true of the virtuous mean?
a. To know the virtuous mean in a given action one should look at the behavior of the prudent person.
b. The virtuous mean is not a mathematical average.
c. Every virtue is opposed by two opposite vices, one of excess and one of defect.
d. Every kind of action can be done virtuously as a mean between a sinful excess and a sinful defect.
