Which of the following is incorrect with regard to short$-$term decision making?

A manager should only focus on relevant information, which could include both

financial and nonfinancial information.

Variable and Fixed costs must be analyzed separately using the contribution

margin approach.

Unitized fixed costs can be misleading in the decision$-$making process because

they appear to behave as variable costs.

Short$-$term decisions typically pertain to decisions made within one year

Variable costs and fixed costs should be computed on a per unit basis so it will

be easier to analyze effects on operating income at various quantity levels.