If the purpose is to let users provide the text-equivalent (for example, a spelling test) then the text-equivalent is not required.
Non-text content that is designed to create a specific sensory experience (such as music without words or visual art) has a text label or a text description explicitly associated with it. [I]
Wendy Chisholm, after a of discussion with Shawn Henry about results of AIR usability test. Combination of option 4 (explanatory link text) with option 2 (links in bullets after criterion). Added "How to" to the beginning of each link.
The box around the checklist and techniques links, and the word "Learn" added by David MacDonald of E-Ramp Inc.