Flem Is an Employee of Glo Goods,Inc

Flem is an employee of Glo Goods,Inc.Flem reports to state officials that Glo is illegally shipping unsafe goods to unsuspecting customers.When Glo learns of Flem's report,Glo fires him.He successfully sues Glo for wrongful discharge.With respect to the employment-at-will doctrine,this is

A) an example of the doctrine.
B) an exception based on employee privacy.
C) a statutory exception.
D) an exception based on an implied contract.