What is an appropriate action during an Investigative Stop?

During an Investigative Stop, using the least intrusive means necessary is the appropriate action because it aligns with the constitutional standard that governs such stops, known as the Terry v. Ohio standard. This standard allows law enforcement officers to briefly detain a person if they have reasonable suspicion that the individual is involved in criminal activity. This approach emphasizes the need to balance the police's duty to investigate with individuals' Fourth Amendment rights against unreasonable searches and seizures.

Using the least intrusive means necessary could involve asking questions, requesting identification, or conducting a brief pat-down for weapons if there is a reasonable belief that the individual is armed. This allows officers to gather information without infringing excessively on the individual's rights or freedom.

The other options present actions that do not align with the principles of an Investigative Stop. Conducting a full search of the individual without probable cause or reasonable suspicion violates the Fourth Amendment. Detaining a suspect for an extended period without justification can also lead to claims of unlawful detention, and arresting individuals on the spot without cause disregards the requirement for reasonable suspicion and due process. Thus, option A reflects the necessary restraint and adherence to legal standards during an Investigative Stop.