Let $$f : R \rightarrow R$$ be defined by
$$f(x) = \frac{x^2 - 3x - 6}{x^2 + 2x + 4}$$
Then which of the following statements is (are) TRUE?

A

f is decreasing in the interval (−2, −1)

B

f is increasing in the interval (1, 2)

C

f is onto

D

Range of f is $$\left[-\frac{3}{2}, 2\right]$$