Final answer:
The individuals involved in the security guard's job encompass the security guards, their employers, and others who engage with or are protected by the guards. These roles form a crucial part of the protective services sector.
Step-by-step explanation:
The people involved in the security guard's job include (4) All of the above: the security guard themselves, the employer, and other individuals who may interact with or be protected by the security guard. Security guards are an integral part of the protective services industry, which is a significant part of the crime prevention and response sector. According to the US Bureau of Labor Statistics, millions of Americans are employed in various protective service roles including but not limited to police departments, the penal system, and as security guards, with others working in legal professions and education within the criminal justice system.