Late Professor Stephen Hawking, the world famous physicist, was diagnosed with Amyotrophic Lateral Sclerosis (ALS), a debilitating progressive and often fatal neurologic illness, at the age of 21. Eventually he became almost completely paralyzed. Despite that, he was able to lead a productive life until he died in 2018 at the age of 76. One of the most important factors that helped him was a wheelchair, which not only kept him mobile but had an inbuilt computer system that allowed him to communicate using a single cheek muscle. The aforementioned wheelchair is an example of:   a. Tertiary prevention   b. Primary prevention   c. Secondary prevention   d. Primordial prevention

Late Professor Stephen Hawking, the world famous physicist, was diagnosed with Amyotrophic Lateral Sclerosis (ALS), a debilitating progressive and often fatal neurologic illness, at the age of 21. Eventually he became almost completely paralyzed. Despite that, he was able to lead a productive life until he died in 2018 at the age of 76. One of the most important factors that helped him was a wheelchair, which not only kept him mobile but had an inbuilt computer system that allowed him to communicate using a single cheek muscle.

The aforementioned wheelchair is an example of: