Which of the Following Is Correct Regarding the Issue of Discrimination

Which of the following is correct regarding the issue of discrimination in a collective agreement:

A) In order to comply with human rights legislation the collective agreement must contain a term that prohibits discrimination.
B) The parties can provide for a higher level of human rights protection in the collective agreement than human rights legislation requires.
C) Because human rights legislation protects against discrimination most collective agreements do not contain terms relating to discrimination.
D) Human rights legislation protects employees against discrimination because of union activity.
E) The parties can agree that the protection provided in human rights legislation against discrimination on the basis of age does not apply so that mandatory retirement is permissible.