Which of the following describes an improperly serviced refrigerant system?

The choice that describes an improperly serviced refrigerant system is the one that highlights a system with documented leaks or one that has not met EPA recovery standards. This is correct because proper servicing of a refrigerant system involves ensuring that no leaks are present and that all regulations, particularly those set by the Environmental Protection Agency (EPA), concerning the recovery of refrigerant during servicing or repairs are strictly followed.

When a system has documented leaks, it indicates that refrigerant is escaping from the system, which can be environmentally harmful and lead to inefficient operation. Not meeting EPA recovery standards means that proper procedures were not followed during maintenance or disposal of refrigerants, which further complicates environmental compliance and may result in significant fines or penalties.

The other choices pertain to conditions that are either efficient or compliant with regulations, illustrating proper service and maintenance practices. Therefore, they do not represent an improperly serviced system as defined by the question.