can someone answer this question?

The direct allocation method Select one: O a. allocates support-department costs to other support departments and to operating departments in a sequential manner that partially recognizes the mutual services provided among all support departments b. allocates support-department costs to operating departments by fully recognizing the mutual services provided among all support departments. O c. requires managers to rank the support departments in the order that the step-down allocation is to proceed. d. allocates each support-department's cost to operating departments only. Which of the following would be considered a service department for an airline? Select one: a. Information systems o b. Maintenance. O C. All of the other answers are correct. d. Flight Catering