Which of the following tags is used for defining a section of navigation links?

The tag used for defining a section of navigation links is the

tag. This semantics of the

element is specifically designed to contain navigational links, helping both browsers and developers recognize that the links it encloses are intended for page navigation. Using the

tag improves the accessibility of a website, allowing assistive technologies to better understand the structure of the navigation areas, thus enhancing user experience.

The other options each serve different purposes: the tag is primarily used to link external resources, such as stylesheets; the

tag is meant to define thematic sections of content; and the

tag is used for introductory content or navigational links at the top of a web page. None of these fulfill the specific role of signifying navigation links as the

tag does.