Under which of the following scenarios is the public policy exception to employment at will most likely to apply?

Question $25$ options:

Following an investigation into employee theft, Joe was fired based on his supervisor's mistaken belief that Joe was the employee responsible for the theft.

The employer's employee handbook states that employees will receive a written warning prior to termination. Joe was fired without having received a prior written warning.

Joe was fired after he refused his supervisor's request to sign his name on an attendance sheet for state$-$mandated training that he did not attend.

Joe was fired shortly before he would have become eligible to receive a bonus because his employer wanted to avoid paying the bonus.