Which of the following is not equal to 1?

Answer:
6. NONE OF THE ABOVE
A. [tex]-2^{0} + 2[/tex] = 1
B. [tex](2^{\frac{1}{3} } 2^{-3})^{0}[/tex]= 1
C.[tex](2x^{-2} yz)^{0}[/tex] = 1
D. [tex]\frac{d^{2} }{b^{0} d^{2} }[/tex] = 1