What action constitutes a violation referenced by "failure to lock and remove key from ignition while parked"?

The action that constitutes a violation referenced by "failure to lock and remove key from ignition while parked" is leaving the vehicle unattended with keys inside. This violation poses a significant safety and security risk, as it makes the vehicle an easy target for theft or unauthorized use. When keys are left inside, it allows anyone access to start the vehicle quickly, which can lead to accidents or criminal behavior.

Securing the vehicle by locking it and removing the keys is a fundamental preventive measure designed to deter theft and protect both the vehicle and its contents. The other options, while they may involve parking or vehicle security in some way, do not directly relate to the specific issue of leaving the vehicle unsecured with keys in the ignition. Leaving windows down or failing to have a fire extinguisher does not create the same immediate risk of theft or unauthorized access as leaving the keys inside does.