Let $$f : [-1, 2] \rightarrow \mathbb{R}$$ be given by $$f(x) = 2x^2 + x + [x^2] - [x]$$, where $$[t]$$ denotes the greatest integer less than or equal to $$t$$. The number of points, where $$f$$ is not continuous, is :

A

5

B

6

C

3

D

4