Find all the critical points of the given plane autonomous system:
A) x^(3)=x^(3)-y y^(3)=x-y^(3)
B) x^(3)=x^(3)-y and y^(3)=x-y^(3)
C) x^(3)=x^(3)-y or y^(3)=x-y^(3)
D) None of the above