The standard electrode potentials, $$E^0$$ of $$\text{Fe}^{3+}/\text{Fe}^{2+}$$ and $$\text{Fe}^{2+}/\text{Fe}$$ at 300 K are +0.77 V and $$-0.44$$ V, respectively. The $$E^0$$ of $$\text{Fe}^{3+}/\text{Fe}$$ at the same temperature is

A

1.21 V

B

0.33 V

C

$$-0.036$$ V

D

0.036 V