The electrode potentials for ${\text{Cu}}_{(\text{aq})}^{2+}+e^{-}\to {\text{Cu}}_{(\text{aq})}^{+}$ and ${\text{Cu}}_{(\text{aq})}^{+}+e^{-}\to {\text{Cu}}_{(\text{s})}$ are $+0.15\text{V}$ and $+0.50\text{V}$ respectively. The value of $E_{{\text{Cu}}^{2+}/\text{Cu}}^{\circ }$ will be:

1. A
   $0.150\text{V}$
2. B
   $0.500\text{V}$
3. C
   $0.325\text{V}$
4. D
   $0.650\text{V}$