Chọn mệnh đề đúng:

A. \(\mathop {\lim }\limits_{x \to  + \infty } f\left( x \right) =  + \infty  \Leftrightarrow \mathop {\lim }\limits_{x \to  + \infty } \left[ { - f\left( x \right)} \right] =  + \infty \)

B. \(\mathop {\lim }\limits_{x \to  + \infty } f\left( x \right) =  + \infty  \Leftrightarrow \mathop {\lim }\limits_{x \to  + \infty } \left[ { - f\left( x \right)} \right] =  - \infty \)

C. \(\mathop {\lim }\limits_{x \to  + \infty } f\left( x \right) =  + \infty  \Leftrightarrow \mathop {\lim }\limits_{x \to  - \infty } \left[ { - f\left( x \right)} \right] =  - \infty \)

D. \(\mathop {\lim }\limits_{x \to  + \infty } f\left( x \right) =  - \infty  \Leftrightarrow \mathop {\lim }\limits_{x \to  + \infty } \left[ { - f\left( x \right)} \right] =  - \infty \)