Which of the following is true about the Canadian Charter of Rights and Freedoms?

a$.$ The Charter rights significant to labour relations are found in Sections $2$ and $15$

b$.$ The Charter applies to both government and private activity.

c$.$ The Charter did not prevent governments from passing legislation that nullified previously negotiated collective agreements.

d$.$ There are no limitations or exceptions to Charter rights.

e$.$ Human rights tribunals and court decisions never challenge Charter rights.