Which of the following actions should you take first with a powered-off smart device?

The correct action is to leave the powered-off smart device in its current state. Keeping the device off is crucial for preserving any potential evidence that may be stored within it. When devices are powered on, there is a risk of the data being altered or deleted, either through automatic updates, notifications, or user interaction. By maintaining the device in a powered-off condition, you ensure that the information it contains remains intact until it can be properly examined by a forensic professional.

Additionally, turning the device back on or removing the battery could unintentionally alter its data or trigger security features that may lead to data loss. Documenting details is an essential step, but it should occur after securing the device in a manner that prevents any alteration of evidence. Therefore, leaving the device off is the safest and most responsible choice when handling a powered-off smart device in an investigative context.