What is costing system refinement? What are the three guidelines for refinement?Costing system refinement A. means muthy changes 10 a simple costing syntem that reduces the use of trad awaraps for anigring the cond of resources to cost obpots and provides better reasurement of the costs of overhead resources used by cifferent cont objects. B. describes a costing approach that uses troad averages for assigning the cost of resources unformy is cost objects when the indivduar products or services, in fact, use those resources in non-unitorm ways. C. describes an event, task, or unit of work with a specified purpose. Consistent mists more stranegic tocus, conting system retinement dentifes acivites in ail functions of the value chain. Costing system refinement frist calculates the costs of individual activities and then ansigns costs to cost objects such as products and services on the basis of the mix of activities needed to produce each product or service. D. Is a process used to categorize various activity cost pooks on the basis of the differt byes of cont elivers, or costatocation bases, or different degrees of difouth in determining cause-and-eflect (or benefits-received) relationships.The three guidelines for refinement include: A.1. Select the activites and cost--thocation bases to use for allociting indired costs is the products2. Identify the indirect costs associated with each cost-allocation base.3. Compute the rate per unit of each cost-allocation base. B.1, Idenaty the products that are the chosen cost objects2. Identify the direct and indirect costs of the products.3. Compute the total cost of the products by adding all dired and indirect costs assigned to the products.