What sub-themes are bundled with Lexicon CSS?

Lexicon CSS is part of Liferay's design system that provides a consistent look and feel across applications. The correct answer, which includes the sub-themes Base and Atlas, directly reflects the structure and design philosophy behind Lexicon.

Base serves as the foundational sub-theme aimed at providing essential styles and components that any Liferay application can utilize. It focuses on basic typographical styles, spacing, and layout structures that are common across various applications.

Atlas, on the other hand, is designed to give a more specialized and comprehensive set of styles that extend the functionality of Base. It addresses more complex scenarios and offers higher-level components that can be integrated seamlessly into applications. The presence of both Base and Atlas in Lexicon CSS allows developers to tailor their UI significantly while ensuring that they adhere to Liferay's design standards and principles.

The other options do not reflect the actual sub-themes associated with Lexicon CSS, as they either refer to generic or non-existent themes within the framework. Thus, focusing on Base and Atlas accurately represents the bundled themes provided in Lexicon CSS, highlighting their importance and function within Liferay's front-end development ecosystem.