Final answer:
The basic duties of a security guard include patrolling, removing trespassers, conducting crowd control, and handling lost property, but not typically making arrests.
Step-by-step explanation:
The basic duties of a security guard typically include activities such as patrolling sites and buildings, removing trespassers if necessary, and ensuring the safety and security of the premises. They may also be responsible for conducting crowd control at events to maintain order and handling situations involving lost property. However, while security guards do secure scenes, the authority to make arrests usually falls to law enforcement officers and not all security guards have the power to arrest. Therefore, the correct answer to the question “Which of the following are basic duties of a security guard?” is A. Patrolling sites and buildings and removing trespassers and C. Conducting crowd control and receiving lost property.