The area of the region enclosed by the curves $$y = x$$, $$x = e$$, $$y = \dfrac{1}{x}$$ and the positive $$x$$-axis is:

A

$$1$$ square units

B

$$\dfrac{3}{2}$$ square units

C

$$\dfrac{5}{2}$$ square units

D

$$\dfrac{1}{2}$$ square units