Final answer:
Personal vendetta and desire for revenge are inappropriate motives for reporting an employer, while concern for public safety and protection of coworkers are valid reasons to report issues. Reporting should be based on ethical and legal concerns, not personal grievances.
Step-by-step explanation:
Typically, an inappropriate motive for reporting an employer to authorities, unless the employer is breaking the law, would be options a) and c) which are Personal vendetta and Desire for revenge. Both options refer to actions taken for personal grievances rather than ethical or legal concerns.
On the other hand, options b) Concern for public safety and d) Protection of coworkers are considered appropriate motives for reporting. For example, the Firestone/Ford tire controversy underscored the necessity for employees to report issues when public safety and the well-being of coworkers are at risk.