What specifically identifies a person taken into custody as being arrested?

The correct choice highlights that the defining action that identifies a person as being arrested is the act of taking them into custody. This process entails a law enforcement officer exercising their authority to detain an individual due to a suspicion of criminal involvement or to enforce compliance with the law.

The act of arrest often includes the intention to bring the individual before the legal system, which signifies a formal procedure that involves rights being read and legal ramifications. While being photographed, placed in handcuffs, or issued a summons are related actions that might occur during or after an arrest, they do not in themselves define the arrest. The core of an arrest is the decision and action by law enforcement to legally detain an individual based on the necessary criteria set forth by law.