Final answer:
The accident file should be kept in a safe to secure sensitive information and maintain confidentiality, protecting employees' privacy and the company’s operational security.
Step-by-step explanation:
The accident file should be kept in the safe primarily b) To secure sensitive information and maintain confidentiality. The personal, financial, and medical information contained in such files often necessitates strict privacy measures to ensure that employees' rights and privacy are protected, as afforded by recent legislation. Furthermore, secure handling of sensitive information is crucial for a company’s operations, illustrated by the consequences faced by Firestone and Ford after the tire controversy. This event underlined the importance of managing safety concerns and internal complaints effectively to prevent harm to public safety and avoid significant financial losses.