Which of the following are ways by which managerial accounting provides information and reports for managers to use in operating the business?

a$.$ Managerial accounting provides the cost of manufacturing a product, which can be used to determine its selling price.

b$.$ Managerial accounting allows for comparing the costs of manufacturing products over time and can be used to monitor and control the cost of direct materials, direct labor, and factory overhead.

c$.$ Performance reports allow management to identify any large amounts of scrap materials or employee downtime.

d$.$ All of these choices are correct.