Based on the information provided, it's challenging to definitively determine the nature of the violations solely based on the total fine amount and the fact that each violation was fined the maximum penalty. The fine amount does not explicitly indicate the severity or nature of each violation.
However, considering that the fine for each violation was the maximum penalty, it might suggest that at least some of the violations were deemed serious or willful. Without specific details about the violations, it's not possible to determine the exact nature of each violation solely based on the total fine amount. Therefore, options (a), (c), and (d) could be potential interpretations, but it's not certain without additional information.