After Three Years of Stellar Performance,Roddy Has Begun to Miss

After three years of stellar performance,Roddy has begun to miss deadlines.After missing the third deadline,his human resource manager met with Roddy and gave him his first written warning.In this situation,what is the role of the duty to warn?

A) to make the employer fully aware of the wrongful behaviour
B) to determine whether there is any excuse for this behaviour
C) to argue there is just cause for termination
D) to inform the employee of the consequences of failing to improve