Final answer:
True, a security guard can be referred to as a security officer, though the term security officer might imply a higher-ranking position in certain contexts.
Step-by-step explanation:
True: A security guard can indeed be referred to as a security officer. Both terms are commonly used interchangeably within the security industry to describe a person employed to protect property, assets, or people. However, the term security officer may sometimes imply a more formal or higher-ranking position than security guard, and organizational structures or specific company policies may dictate different titles and responsibilities within a security team.