Final answer:
The correct term that describes the operation mode of a basic service set (BSS) is Operational state.
Step-by-step explanation:
The correct term that describes the operation mode of a basic service set (BSS) is Operational state. A basic service set is a group of devices that are connected to the same Wi-Fi network. The operational state refers to the current status or mode of the BSS, indicating whether it is active, inactive, or transitioning between states.