Which of the following is characteristic of companies that use a plantwide overhead allocation rate? a) A plantwide overhead allocation rate is used by companies that make few products and where production is similar across product lines. b) A plantwide overhead allocation rate is used by large companies with multiple overhead allocation rates for each product line. c) A plantwide overhead allocation rate is used by companies with multiple products across multiple product lines. d) A plantwide overhead allocation rate is used by companies that make different products using varying amounts of overhead.