Final answer:
Cannon should ask the wheelchair user how to assist and follow their instructions. Sidewalk ramps and Braille signs are both forms of accessibility and accommodations required by the ADA.
Step-by-step explanation:
The question deals with how to assist someone who requires a wheelchair. The most appropriate measure for Cannon to take would be to ask how to assist and follow the customer's instructions. This ensures that the customer's needs and preferences are respected and met.
As for the second question, sidewalk ramps and Braille signs are forms of accessibility for people with disabilities and are accommodations required by the Americans with Disabilities Act (ADA). Therefore, the correct answer would be d. both b and c, as these are mandated by law to ensure accessibility and accommodate individuals with disabilities in public spaces.