which expression is not equivalent to: (3x^(4))^(0)

a. 3x^(2)*((1)/(3))x^(-2)
b. (974x^(12)y)^(0)
c. (3x^(2))/(3x*x)
d. x^(4)*0x^(3)

d. x^(4)*0x^(3)