A company produces washers and dryers in an assembly-line process. Labor costs incurred during a recent period were: corporate executives, $500,000; assembly-line workers, $173,000; security guards, $45,000; and plant supervisor, $110,000. The total of company's direct labor cost was: Select one: O a. $283,000 O b. $167,000 O c. $828,000 O d. $718,000 O e. $173,000