Why Are Clear and Concise Expectations Important for an Employer

Why are clear and concise expectations important for an employer to provide to an employee on the grounds for immediate dismissal?

A) So the employee knows what things he or she can do wrong without being fired
B) So a patient cannot sue the healthcare provider for questionable care
C) So the employer may terminate an employee without following the corrective action procedures
D) So the employer may fire anybody at any time