If [a] denotes the greatest integer less than or equal to a for $$a \in R$$, then the value of the integral

$$\int_{0}^{1.7} [x^2] dx$$ is equal to

A

$$2.4 + \sqrt{2}$$

B

$$2.4 - \sqrt{2}$$

C

$$2.4 + \frac{1}{\sqrt{2}}$$

D

$$2.4 - \frac{1}{\sqrt{2}}$$