What role do OSGi modules play in the context of Theme Contributors?

Theme Contributors in Liferay are essential components that allow developers to extend the themes used across the portal. OSGi (Open Services Gateway initiative) modules specifically enhance the functionality and aesthetics of user interfaces by registering UI resources such as CSS, JavaScript, and images. This capability enables themes to not only present information but also to manage how it is displayed to the user, thereby improving the overall user experience.

OSGi modules act as modular building blocks that ensure the reusable and dynamic loading of these UI resources within Liferay, supporting theme customization and extensibility. They allow for better organization of the code and assets associated with a theme, facilitating improvements in both styling and structure of the web interface. In doing so, they play a crucial role in delivering a cohesive and stylish presentation layer for Liferay sites.

The other options, while relevant to different aspects of application development, do not accurately describe the primary function of OSGi modules in relation to Theme Contributors.