Which of the following is the best protection for a company that wishes to prevent the lapping of trade accounts receivable?

a. separate duties so that the bookkeeper in charge of the general ledger has no access to incoming mail.
b. separate duties so that no employee has access to both checks from customers and currency from daily cash receipts
c. have customers send payments directly to the company's depository bank
d. request that customers' payment checks be made payable to the company and addressed to the chief financial officer

Caleb construction (cc) incurs supervisor salaries expense in the construction of homes. if cc manufactures 100 homes in a year, fixed supervisor salaries will be $400,000. with the current construction supervisors, cc's productive capacity is 150 homes in a year. however, if cc is contracts to build more than 150 homes per year, it will need to hire additional supervisors, which are hired as full-time rather than temporary employees. cc's productive capacity would then become 200 homes per year, and salaries expense would increase to $470,000. how would cc’s salaries expense be properly classified? fixed variable mixed stepped curvilinear