Which of the following statements is true of the Americans with Disabilities Act $($ADA$)$ of $1991?$

a$.$ Employers are required to make reasonable accommodation to disabled individuals.

b$.$ Interviewers are prohibited from asking a candidate if he or she can meet the attendance requirements for a job.

c$.$ Interviewers are permitted to ask candidates the number of sick leaves he or she took at his or her previous job.

d$.$ Employers are permitted to use employment physical exams that could reveal a psychological or physical disability for making hiring decisions.

e$.$ Employers can ask pre$-$employment questions to investigate disabilities.