A student's IEP mandates the use of audiobooks in place of textbooks. When considering the UDL principles, which of the following is correct?

a. Audiobooks may be beneficial for other students, so the educator could make them available for everyone.
b. A well-designed UDL learning experience would not require the use of audiobooks, so the teacher would not need to provide them.
c. Audiobooks are not flexible materials, nor are they considered accessible, so they would only be provided to the student whose IEP required them.
d. The teacher should provide not only audiobooks but other formats as well, like braille, sign language, video, etc.