Match each of the following definitions of costs to the cost classifications.

The combined amount of all costs

Remains constant over a relevant range of volume: when it reaches the end of its relevant range, it changes by a lump sum and remains at that level until it exceeds that relevant range

Has a component that remains the same over all volume levels and another component that increases in direct proportion to increases in volume

Remains constant over all volume levels within the relevant range

Increases in direct proportion to increases in volume; its amount is constant for each unit produced.