In a certain electrical network, the three nodes $$A$$, $$B$$ and $$C$$ are each at a potential of $$1.0\,\text{V}$$ while the node $$D$$ is at a potential $$2.0\,\text{V}$$. The potential at the Node $$O$$ in volt is

A

$$\frac{3}{2}$$

B

$$\frac{4}{3}$$

C

$$\frac{5}{4}$$

D

$$\frac{6}{5}$$