Cho hàm số \(f(x)\) thỏa mãn \(\mathop {\lim }\limits_{x \to {{2019}^ + }} f\left( x \right) =  - 2019\) và \(\mathop {\lim }\limits_{x \to {{2019}^ - }} f\left( x \right) = 2019\)...

A. \(\mathop {\lim }\limits_{x \to 2018} f\left( x \right) = 0\)

B. \(\mathop {\lim }\limits_{x \to 2019} f\left( x \right) = 2019\)

C. \(\mathop {\lim }\limits_{x \to 2019} f\left( x \right) =  - 2019\)

D. Không tồn tại \(\mathop {\lim }\limits_{x \to 2019} f\left( x \right)\)