Answer:
Relevant Range
Step-by-step explanation:
The production range between 120000 and 150000 is called the "Relevant range".
This production range is called Relevant range because the expected fixed cost will not vary if the production is in the range 120000 to 150000.
Also, the for increase in production more than 150000 will lead to the extra cost or if the production is less than 120000 the company may need to reduce its fixed cost.