Which of the following is true regarding brands?

You are building an educational games website for children. You have determined that your users respond best to large, colorful, easy-to-read buttons to navigate through the site.
You've created a prototype of the navigation element, and want to make sure it meets your user's needs. What kind of testing should be performed at this stage?

You are reviewing the results of usability tests for your website. Several of the comments stand out as "red flags" mentioning that for colorblind visitors or those who viewing the site on mobile devices are experiencing confusion with readability or navigation. Which principle of visual design should you revisit to make the necessary improvements?

You are starting a web site redesign project for a dog trainer who specializes in preparing service animals for people with special needs. His primary customers have mobility challenges. What would be a primary consideration in the redesign of the site?