Your employment contract states that the employer can terminate you by giving three weeks prior notice.

a.

This clause is valid and you can only sue the employer under the Labour Standards Act

b.

The termination clause is invalid, therefore you do not have a valid employment contract

c.

This clause is invalid and you can nevertheless claim reasonable notice of termination

d.

This clause is valid if you signed a written employment contract

e.

None of the other answers is correct