An interviewer asks the following question in a job interview $$Are you able to walk up and down five flights of stairs?$$ Which of the following statements is correct?

Question $19$ options:

a$)$

This question is allowed.

b$)$

Since this question involves physical disability, it is not allowed.

c$)$

If the job requires a person go up and down five flights of stairs, this is a bona fide occupational requirement and the question is allowed.

d$)$

If the worker will be on the fifth floor, this question is allowed because there might be a fire drill sometime.