Which of the following statements regarding a segmented contribution margin income statement is true?

Segment margin is a better measure of an operating segment's long$-$term profitability than contribution margin.

The company's common fixed costs should be allocated to operating segments when making decisions.

A key characteristic of a traceable fixed cost is that the cost does not disappear even if the operating segment is eliminated.

An operating segment's segment margin equals its sales revenue less its traceable variable costs.