In which of the following types of cases does a plaintiff attempt to prove that while an employer's policy or practice appears to apply to everyone equally, its actual effect is that it disproportionately limits employment opportunities for a protected class?
A. Disparate-treatment cases
B. Disparate-impact cases
C. Sexual harassment cases
D. All the above
E. Disparate-treatment cases and disparate-impact cases, but not sexual harassment cases