Final answer:
A security guard can legally search an individual with their consent or upon arrest if there is reasonable belief the person may have a weapon, in line with the Fourth Amendment. Using force without consent or trickery is generally not lawful.
Step-by-step explanation:
The conditions under which a security guard can search an individual are specific and legally bound. The options presented include: A) With the consent of an individual, which is a situation where an individual agrees to be searched; B) By force and against their will, which is generally illegal unless certain conditions such as arrest or immediate threat are present; C) Upon arrest, specifically if there is reasonable belief that the individual may possess a weapon, as established in the Terry v. Ohio case; and D) Tricking an individual into consenting and then scaring them into compliance, which is not a legal method and can be considered coercion or entrapment. The Fourth Amendment protects individuals against unreasonable searches and seizures, and searches without consent typically require a warrant or must meet certain exigent circumstances.