With Regard to Whistle-Blowers

With regard to whistle-blowers:

A) employers may terminate whistle-blowers if they can prove a reason for termination independent of retaliation for the whistle-blowing.
B) based on the employment-at-will doctrine, employers may terminate whistle blowers without evidencing a reason independent of retaliation for the whistle blowing.
C) every state law protects both government and private employees from retaliation.
D) there is no federal whistle-blower act