Which command would be correct to control udev's internal state?

The command to control udev's internal state is "udevadm control." This command allows users to manage the behavior of the udev daemon by sending commands to it. For example, using this command, one can trigger a reload of udev rules or request that the daemon exit gracefully. This is essential for ensuring that the device manager operates according to current system needs and configurations.

The other options listed do not pertain to udev's functionality in the way that "udevadm control" does. For instance, there are no commands such as "udevadm manage," "udevadm oversee," or "udevadm operate" within the udev management context, making them incorrect choices for controlling udev's internal state.