Final answer:
Public Wi-Fi access points are commonly found in parks, libraries, and cafes. The correct answer is all of the above, as these locations typically offer free internet access to the public.
Step-by-step explanation:
Designated locations where Wi-Fi access points are publicly available include: a. Parks, b. Libraries, and c. Cafes. Therefore, the correct answer to the question is d. All of the above. These public spaces offer internet connectivity to the community and are examples of services that contribute to public accessibility and convenience. Similar to how some public goods offer a mixture of free services along with fees for certain purposes, such as parking at a public city park, public Wi-Fi can also be one of the several amenities provided in communal areas for the enhancement of public welfare.