The automatic dispensing of expendable inventory occurs when what is displayed on the CMDS control display unit?

The correct choice is based on the operation of the Countermeasures Dispenser System (CMDS) and its functionality regarding expendable inventory. When the display shows "Lo," it indicates that the system is prepared to dispense expendable items such as flares or chaff in response to threats. This low setting signifies that the inventory level is at a threshold that triggers automatic dispensing protocols, ensuring that countermeasures are available for use when needed.

In contrast, "HI" generally refers to a high alert status or possibly an indication of a malfunction, while "OK" typically denotes that the system is functioning within normal parameters but does not initiate dispensing. "READY" suggests that the system is set for possible operation but does not provide an automatic dispensing signal. Thus, the display of "Lo" is the specific condition that activates the automatic dispensing of expendable inventory.