Select the correct answer. Which statement describes the end behavior of the function? f(x) = x^2 - 4/x^2 - 9

A. The function approaches 0 as x approaches negative infinity and infinity.

B. The function approaches 4/9 as x approaches negative infinity and infinity.

C. The function approaches 2/3 as x approaches negative infinity and infinity.

D. The function approaches 1 as x approaches negative infinity and infinity.