Which of the following statements about maximum sustainable yield is incorrect?

a) The maximum sustainable yield for a population is the population’s growth rate at K/2. b) The maximum sustainable yield for a population can be difficult to determine because it is not always possible to accurately measure N. c) The maximum sustainable yield for a population can be difficult to determine because it is not always possible to accurately measure K. d) The maximum sustainable yield for a population is a useful management guideline for harvesting plant products such as timber, but is not helpful for managing animal populations. e) The concept of maximum sustainable yield can generate useful information for fighting the growth of pest species.