Answer:
The correct answer is the option second option: An exception based on public policy.
Step-by-step explanation:
To begin with, inside the area of the United States' Law the term of "employment-at-will" refers to a doctrine that allows the employer and employee to work together in an indefinite period of time and let them both being able to terminate the contract without any necessary fair cause. It is an unique U.S.' construct because in the majority of the countries worldwide the government asks for a reason to fire someone or even to stop working for someone. However, there exceptions to the rule that goes against this doctrine, one of them is the case of the exception based on public policy that consider the fact of unable the employer to fired the employee in the cases where the last states a violation to a law and other cases.