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  The ADA prohibits an employer from discriminating against an employee 'because of the disability of such individual in regard to job application procedures, the hiring, advancement, or discharge of employees, employee compensation, job training, and other terms, conditions, and privileges of employment.' 42 U.S.C.  § 12112(a). As defined by the ADA, 'discrimination' includes, inter alia, not making reasonable accommodations to the known physical or mental limitations of an otherwise qualified individual with a disability who is an applicant or employee, unless . . . [the employer] can demonstrate that the accommodation would impose an undue hardship on the operation of ...