Final answer:
A complaint against a security guard can be reported by supervisors, clients, visitors, or anyone who witnesses inappropriate behavior, indicating that workplace safety involves all individuals interacting with the environment.
Step-by-step explanation:
A complaint against a security guard can be reported by anyone who has a concern or has witnessed an inappropriate act, this includes supervisors, clients, people who go on the property (such as visitors or customers), or essentially any individual who observes the security guard's behavior. It's essential to understand that workplace safety and accountability extend beyond internal staff; it includes anyone interacting with the workplace environment. Usually, companies have protocols in place for handling such complaints to ensure that all concerns are addressed professionally and promptly.