Red flags about readability for colorblind and mobile users; which visual design principle should you revisit?

• A. ERBU
• B. KISS
• C. CMYK
• D. CARP

Answer: (D)

Red flags about readability for colorblind and mobile users point to how we communicate information beyond color. CARP focuses on four key relationships in design, with Contrast as the most critical for legibility. If you revisit CARP, you’ll check that text contrasts sufficiently with its background, and that information is conveyed through typography, spacing, and structure rather than color alone. On mobile, where space is limited, strong contrast and a clear visual hierarchy help users scan and read without depending on color cues. Reaffirming these principles also means grouping related items, aligning elements consistently, and using repetition to reinforce readability.

The other options don’t address readability and accessibility in this context: a color model (CMYK) is about color printing, not design principles; a broad simplicity rule (KISS) helps overall clarity but doesn’t target colorblind or mobile readability specifically; and an unfamiliar acronym (ERBU) isn’t a standard UI principle.