The Premier of Your Province Wants to Invoke the Notwithstanding

The premier of your province wants to invoke the notwithstanding clause in order to avoid the consequences of a recent decision by the Supreme Court of Canada.Before she tries to do so,however,she wants to know as much as possible about the notwithstanding clause.Which of the following statements is TRUE?

A) The notwithstanding clause cannot be invoked unless the relevant people are willing to amend the Constitution.
B) If the notwithstanding clause is invoked,it will have effect for 10 years,after which it will lapse unless it is reapplied.
C) The notwithstanding clause can be invoked by the federal government but not by a provincial government.
D) The notwithstanding clause can be used against equality rights but not against mobility rights.
E) The notwithstanding clause has been invoked frequently in the western provinces but not in Ontario.