Explanation
Universal Theme is a responsive, versatile, and customizable user interface for your APEX apps. It is designed uniquely for Oracle APEX to make it easy for developers to build beautiful, modern applications, at any scale, for any purpose, that work on any device. All of the statements given are true about Universal Theme:
Features a responsive design and enables developers to create web applications without extensive knowledge of HTML, CSS, or JavaScript. Universal Theme adapts to different screen sizes and devices using CSS media queries and grid layout. It also provides a rich set of UI components, template options, and theme styles that can be used declaratively without writing custom code.
Universal theme is the default theme that is shipped with Oracle APEX. Universal Theme is the default theme for new applications created in APEX 5.0 or later. It is also the recommended theme for upgrading existing applications to the latest version of APEX.
Uses a 12-column grid layout system for arranging components on a page. Ships with a variety of pre-built theme styles. Universal Theme uses a 12-column grid layout system based on Flexbox to arrange components on a page. It also ships with a variety of pre-built theme styles that can be applied to change the look and feel of the application.