Final answer:
Sidewalk ramps and Braille signs are accommodations required by the Americans with Disabilities Act and are also considered forms of accessibility for people with disabilities, making the correct answer both b and c.
Step-by-step explanation:
Sidewalk ramps and Braille signs are examples of accommodations required by the Americans with Disabilities Act and are also forms of accessibility for people with disabilities. This makes the correct answer d) both b and c. It's important to note that these accommodations are designed to remove barriers and provide equal opportunities in public spaces for individuals with various disabilities.