What types of techniques are associated with each success criterion in WCAG?

The correct answer identifies that the techniques associated with each success criterion in the Web Content Accessibility Guidelines (WCAG) are categorized into three types: Sufficient, Advisory, and Failure.

Sufficient techniques are those that, when properly implemented, meet the success criterion and ensure that the requirement is fully addressed. They provide a reliable way to resolve accessibility issues by outlining how to effectively implement features that support accessibility.

Advisory techniques refer to methods that are not mandatory for compliance but provide additional guidance on achieving accessibility. They may offer best practices or further enhancements that can improve the accessibility of content, but they are not necessary to satisfy the criteria.

Failure techniques are used to highlight methods that will not meet the specified success criterion. These serve to clarify what does not fulfill the accessibility requirements, helping developers and content creators understand pitfalls to avoid when implementing accessibility features.

Recognizing these categories is crucial for understanding how to approach web accessibility and the variety of ways to achieve compliance with the WCAG standards. The other options do not align with the established terminology in WCAG; they use terms that may imply a different level of importance or applicability, which does not reflect the nuanced approach WCAG takes towards accessibility techniques.