Each of the following mandates disqualification in a driver with a history of alcoholism EXCEPT:

The correct response highlights that voluntary participation in a 12-step program as a means of recovery does not mandate disqualification from driving. This is because actively engaging in a recovery program demonstrates a commitment to addressing the issue of alcoholism, which is viewed positively in the context of the regulations governing driver qualifications.

On the other hand, having a current diagnosis of alcoholism or failing to complete necessary counseling or treatment indicates ongoing issues with alcohol dependence that could impair judgment and driving ability, leading to disqualification. Essentially, while participation in recovery programs is encouraged and can show progress towards managing alcoholism, it does not, in itself, disqualify a driver in the eyes of the regulations. The presence of an active diagnosis or lack of completed treatment would raise concerns regarding the individual's fitness to drive safely.