When selecting a volume-based cost driver, the goal is to: a. choose a period where a cost driver is at a low level so that overhead costs will be at a low level. b. none of these are goals when selecting a volume-based cost driver. c. eliminate complexity by using a plantwide overhead rate for all of a firm’s products. d. choose labor hours for a computer-integrated manufacturing processes. e. choose an input that varies in a pattern that is most similar to the pattern with which overhead costs vary