Which statement is correct regarding Gosu code and PCF files?

The statement that placing logic related to a PCF file in a UI helper class is correct because it adheres to the best practices of separating concerns within the Guidewire architecture. In Guidewire, PCF (Page Configuration File) files are primarily meant for defining the user interface layout and behavior, rather than for containing complex business logic. By extracting the logic and placing it in a UI helper class, maintainability and readability of both the PCF files and the codebase are improved. This separation allows developers to manage UI concerns independently from business logic, promoting cleaner, more modular code.

In contrast, other options suggest either combining Gosu code directly within PCF files, which can lead to cluttered and less maintainable code, or incorrectly stating that Java must be used for all logic. Using Gosu is encouraged for logic within the Guidewire environment, as it provides significant benefits in terms of integration and performance within the platform.