The requirement to inform a suspect of their rights begins once the suspect is:

The requirement to inform a suspect of their rights, commonly known as Miranda rights, begins once the suspect is arrested and subjected to interrogation. This is grounded in the Fifth Amendment, which protects individuals from self-incrimination. The U.S. Supreme Court established that when someone is taken into custody and subjected to questioning that could incriminate them, they must be notified of their rights to remain silent and to have an attorney present.

While being detained without charges or held for an extended period may involve various legal considerations, it is the combination of arrest and interrogation that triggers the obligation to provide these warnings. Similarly, booking at the police station does not necessarily equate to being in a situation where the individual is actively being interrogated. Therefore, the correct answer underscores the critical moment when a suspect is both in custody and questioned, marking the necessity for these constitutional protections to be communicated.