Which expression is a perfect cube? 12x12y18 12x27y125 64x15y18 64x27y125

12x^{12}y^{18}: perfectcube(\times) 12x^{27}y^{125}: perfectcube(\times) 64x^{15}y^{18}: perfectcube(\checkmark) 64x^{27}y^{125}: perfectcube(\times)