Which of the following actions is an example of unlawful operation in Minnesota?

Operating an unregistered motorized boat is an example of unlawful operation in Minnesota because all motorized vessels are required by law to be registered. This registration not only ensures that the boat meets safety, operational, and regulatory standards but also provides a way for authorities to identify and track the boats in use. Without proper registration, a boat is operating illegally, which can lead to fines or other consequences for the operator.

In contrast, operating a boat with a valid registration, a sailboat in designated areas, or a registered boat are all compliant with Minnesota regulations. These actions demonstrate adherence to safety and legal requirements necessary for boating within the state's waters. Proper registration and adherence to designated areas are crucial for maintaining safety and organization on the water.