Which of the following is a correct way to rewrite the following expression with the correct domain limitation

Which of the following is a correct way to rewrite the following expression with the correct domain limitations?

z^4−5z^2+4/z^2+z−2

A
(z+2)(z−1) (z≠−2,1)

B
(z−2)(z+1) (z≠1)

C
(z−2)(z+1) (z≠−2,1)

D
z (z≠−2,−1)

E
z−4/z−2 (z≠2)

The answer is C

your right answer choice is B cos when you simplify that expression you get (z-2)(z+1) and when z not equal to -1 you're fine