Factorize each of the following:
 
(i) \(27y^3 + 216z^3=\)
 
(ii) \(216m^3 – 27n^3=\)
Answer variants:
(6m−3n)(36m2+18mn+9n2)
(6m+3n)(36m2−18mn+9n2)
(3y−6z)(9y2+18+36z2)
(3y+6z)(9y2−18+36z2)