Final answer:
The plaintiff does not need to prove their employer's awareness of their disability to bring a successful claim under the ADA.
Step-by-step explanation:
To bring a successful claim under the Americans with Disability Act (ADA), the plaintiff must prove certain elements. However, one of the elements mentioned in the options is not required to be proven. The correct option is c) Their employer is unaware of their disability. This means that the plaintiff does not need to prove that their employer was unaware of their disability in order to bring a successful claim under the ADA. They do need to prove that they have a disability, they are qualified for the job, and they suffered adverse employment action due to the disability.