A resource server contains an access control system. When a user requests access to an object, the system examines the permission settings for the object and the permission settings for the user, and then makes a decision whether the user may access the object. The access control model that most closely resembles this is: a. Mandatory access control (MAC)
b. Discretionary access control (DAC)
c. Non-interference
d. Role based access control (RBAC)

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