Budget performance report for a cost centerThe Eastern District of Adelson Inc. is organized as a cost center. The budget for the Eastern District of Adelson Inc. for the month ended December $31$ is as follows:Line Item DescriptionAmountSales salaries$$819,840$System administration salaries$448,152$Customer service salaries$152,600$Billing salaries$98,760$Maintenance$271,104$Depreciation of plant and equipment$92,232$Insurance and property taxes$41,280$ Total$$1,923,968$During December, the costs incurred in the Eastern District were as follows:Line Item DescriptionAmountSales salaries$$818,880$System administration salaries$447,720$Customer service salaries$183,120$Billing salaries$98,100$Maintenance$273,000$Depreciation of plant and equipment$92,232$Insurance and property taxes$41,400$ Total$$1,954,452$

Adelson Inc.

Budget Performance Report$-$Manager, Eastern District

For the Month Ended December $31$

Line Item Description For the Month Ended December $31$

Sales salaries

System administration salaries

Customer service salaries

Billing salaries

Maintenance

Depreciation of plant and equipment

Insurance and property taxes

$2.$ For which costs might the manager be expected to request supplemental reports?

a$.$ Customer service salaries.

b$.$ Customer service salaries and maintenance.

c$.$ Customer service and sales salaries as well as maintenance.

d$.$ Maintenance.