In triangles $$ABC$$ and $$ADC$$ in the above figure, $$\angle BAC = \angle ADC = 90^\circ$$. Also, $$DC$$ is $$2$$ units long and $$AC$$ is $$4$$ units long. What is the length of $$BC$$?

A

8 units

B

10 units

C

$$6\sqrt{3}$$ units

D

$$12\sqrt{3}$$ units