Dividing rational expressions

4y-8/y+2 divided by y-2/ y^2-4

which one is the answer?

a. 4(y-2)^2/ y+2
b. 4
c. 4(y-2)/ y+2
d. 4 (y-2)

18 points : )

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If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?