Federal agents are working with a cooperating witness on an investigation, and they wish to wiretap a telephone conversation between their witness and the investigation's target. Their witness is aware of and agrees to the wiretap. What additional permission must the agents obtain to remain compliant with the Electronic Communications Privacy Act $($ECPA$)?$ A$.$ They must obtain permission from the communication service provider. B$.$ They must obtain permission from the target. C$.$ No additional permission is required. D$.$ They must obtain a court order.