Which of the Following Is True of a Glass Ceiling

Which of the following is true of a glass ceiling?

A) It refers to a set of proactive employment practices to compensate for historical discrimination against women, minorities, and individuals with disabilities.
B) It refers to a set of workplace guidelines to eliminate discriminatory and unethical practices such as summary dismissal and positive and negative discrimination.
C) It refers to a modification to a job or work environment that gives a qualified individual an equal employment opportunity to perform.
D) It refers to discriminatory practices that have prevented women and other minority status employees from advancing to executive-level jobs.