Final answer:
After executing an arrest warrant, an officer must inform the suspect of their Miranda rights, which include the right to remain silent and the right to legal counsel. The correct option is 3).
Step-by-step explanation:
Once an arrest warrant is executed, an officer is then required to inform the suspect of their rights. This obligation stems from the landmark Supreme Court decision in Miranda v. Arizona, which mandates that law enforcement officials must advise criminal suspects of their rights under the Constitution. These rights, known as Miranda rights, include the right to remain silent, the right to consult with a lawyer, and to have one appointed if they cannot afford one, among others. Notifying the suspect's lawyer is not an immediate requirement upon executing an arrest warrant, and conducting a search of the suspect's belongings would also require additional legal thresholds to be met, such as a search warrant or the suspect's consent, unless the items are in plain view or there are exigent circumstances.