Which of the following actions would be considered discriminatory under federal laws? Explain your answers.

a. A company creates a policy that all employees must retire by age 65.

b. A supervisor gives the raises to men, because they have families to support.

c. A company that recruits at colleges and universities has a practice of making at least 20 percent of its visits to schools that are historically black.

d. In a department where employees must do a lot of overtime work on Saturday, the supervisor avoids hiring Jews because Saturday is their day of rest and worship.