Oakley Is an Employee of Paving Inc

Oakley is an employee of Paving Inc., which is performing a contract for the federal government. Oakley learns that Paving is overcharging for the work. If he publicly reports the fraud, the law may protect him from being fired from his job. With respect to the employment-at-will doctrine, this is

A) an example of the doctrine.
B) an exception based on contract theory.
C) an exception based on public policy.
D) an exception based on a statute.