A correct option is option (b), i.e. when the short-run ends.
What is considered the long run?
The long run is a time frame during which all cost and production parameters are erratic. In the long run, businesses can modify all costs, however in the short run, they can only affect pricing by changing production levels.
How long is the long run in years?
In the long run, all costs will fluctuate. The long run is not a fixed amount of time and is dependent on the particulars of the company in question. The long run is any term longer than a year if you have a one-year lease on your factory since after that time you are no longer subject to the lease.
Learn more about long run: https://brainly.com/question/17029465
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