Simplify: (16x−4)1/2(x6)1/3\frac{(16x^{-4})^{1/2}}{(x^6)^{1/3}}(x6)1/3(16x−4)1/2 for x>0x > 0x>0
4x4\frac{4}{x^4}x44
14x4\frac{1}{4x^4}4x41
4x8\frac{4}{x^8}x84
4x44x^44x4