A function $$f \colon \mathbb{R} \rightarrow \mathbb{R}$$ is defined by $$f(x) = |x - 1| + |x - 2| + |x - 3|$$ for all real numbers $$x$$. Then

A

$$f(x) = 6 - 3x$$, for all $$x < 0$$

B

$$f(x) = x$$, for all $$x < 2$$

C

$$f(x) = 6 - 3x$$, for all $$x > 2019$$

D

$$f(x) = 3x + 6$$, for all $$x < 2019$$