With Regard to the Duty to Accommodate,what Remains Unclear from the Cases

With regard to the duty to accommodate,what remains unclear from the cases reported to date?

A) the need to modify jobs to accommodate disabled people
B) whether rules requiring certain workers to wear hard hats are discriminatory
C) the need to modify buildings to accommodate disabled people
D) exactly what constitutes "undue hardship," beyond which point the employer is not required to make further accommodations
E) the need to modify work schedules to accommodate people of different religious backgrounds