Select the correct answer.
if f(x)=2-x^1/2 and g(x)=x^2-9 , what is the domain of g(x) ÷ f(x)?

a. (- infinity, 2] and [2, infinity)

b. [0,4) and (4, infinity)

c. (- infinity, 2] and (4, infinity)

d. (- infinity, -2] and [2, infinity)