The design should be optimized for color contrast-ratio and screen-reading technology, as these are the best practices for designing for visually impaired people12. Color contrast-ratio is the difference in brightness and color between the foreground and the background of a text or an image3. A high color contrast-ratio makes the text or the image more visible and readable for people with low vision or color blindness4. Screen-reading technology is a software that converts text and images on a screen into speech or braille output for people who are blind or have severe vision loss. A design that is compatible with screen-reading technology ensures that the content and functionality of the product are accessible and understandable for these users. References: Accessibility Standards - Salesforce Help, How to Configure Salesforce for your Blind and Low Vision Users - Salesforce Admins, Color Contrast Ratio - WebAIM, Color Contrast Checker - WebAIM, [Screen Readers - WebAIM], [Screen Reader User Survey #8 Results - WebAIM]

The correct answer is B. When designing for a visually impaired audience, it is important to optimize for color contrast-ratio and screen-reading technology. This will ensure that the design is accessible to those with visual impairments. Color contrast-ratio ensures that the text is easily readable, while screen-reading technology allows people with visual impairments to access the content on the website using a screen reader. Additionally, Salesforce has some great resources on designing for accessibility, such as their Accessibility Design Guide [1] and their Accessibility Best Practices [2].

[1] https://www.salesforce.com/content/dam/web/en_us/www/documents/salesforce-accessibility-design-guide.pdf [2]  https://developer.salesforce.com/docs/atlas.en-us.salesforce_accessibility_best_practices.meta/salesforce_accessibility_best_practices/accessibility_best_practices_intro.htm