Which of the following design requirements enhances online content accessibility for people with disabilities?

Labeling videos with subtitles and captions significantly enhances online content accessibility for people with disabilities, particularly individuals who are deaf or hard of hearing. Subtitles and captions provide a textual representation of spoken dialogue and relevant sounds, allowing users to fully comprehend the audio content of videos. This accessibility feature ensures that all viewers, regardless of auditory ability, can engage with the material effectively.

In contrast, high-resolution images primarily improve visual clarity and do not address accessibility for individuals with hearing impairments. Exclusive color usage can create challenges for those with color blindness and may limit the audience's access to visual information. Unique font styles, while they may enhance design aesthetics, can hinder readability for individuals with visual processing disorders or dyslexia. Thus, including subtitles and captions is a crucial design requirement that directly addresses the needs of users with disabilities.