If `E_(1)^(0)`is standard electron potential for `Fe//Fe^(+2)` and `E_(2)^(0)` is for `Fe^(+2)//Fe^(+3)` and`E_(3)^(0)` for `Fe//Fe^(+3)` which of the following relation is correct?

If E_(1 )^(0) is standard electrode potential for Fe//Fe^(+2) , E_(2)^(0) is for Fe^(+2)//Fe^Fe^(+3) and E_(3)^(0) is for Fe// Fe^(+3) then the relation between E_(1)^(0), E_(2)^(0) and E_(3)^(0) will be :

Standard electrode potentials are Fe^(2+)//Fe, E^(@) = -0.44 V Fe^(3+)//Fe^(2+), E^(@) = +0.77 V If Fe^(3+), Fe^(2+) , and Fe block are kept together, then

Standard electrode potentials are Fe^(2+)//Fe, E^(@) = -0.44 V Fe^(3+)//Fe^(2+), E^(@) = -0.77 V If Fe^(3+), Fe^(2+) , and Fe block are kept together, then