What years were WCAG 2.0 and 2.1 released?

The correct dates for the release of the Web Content Accessibility Guidelines (WCAG) are 2008 for WCAG 2.0 and 2018 for WCAG 2.1. WCAG 2.0 was developed to ensure that web content is accessible to a wider range of users, including individuals with disabilities, and it gained widespread adoption after its release. WCAG 2.1 expanded upon the principles established in 2.0 by addressing additional accessibility needs, particularly those related to mobile and touch technology. This evolution in the guidelines reflects the ongoing commitment to improving web accessibility as technology and user needs continue to evolve. Therefore, the choices that suggest alternative years do not align with the actual release history of these guidelines.