Answer:
a. relevant range of operations
Step-by-step explanation:
Relevant range of operations is the normal production range and sales, experienced by a firm not considering period of economic boom and economic depression.
Management often times make use of relevant range of operations for decison making due to its consistency because future economy boom or recession can not be relied upon as a basis for production volume .
Example is when a firm plan to produce within a relevant range but produced less than what they have aggregated, then the firm can make further use of automation.