Which statement about the use classification of pesticides in California is true?

The statement that only specific fumigant products have a use classification label is correct because, in California, pesticides are categorized based on their use and or application methods. Fumigants are a specific group that typically carry special use classifications due to the nature of their application and potential risks involved. This classification ensures that users are aware of the necessary precautions and regulations surrounding their use, which can include restrictions on how and where they can be applied. In contrast, the other options suggest that all pesticides have such a classification, that all pesticides are unrestricted, or that use classification labels are not mandatory, all of which do not accurately reflect California's pesticide regulatory framework.