From the following $${E}^{o}$$ values of half cells
(i) $$A\rightarrow { A }^{ + }+e; \,\,\,\, { E }^{ o }=+1.2V$$
(ii) $${ B }^{ - }\rightarrow B+e; \,\,\,\, { E }^{ o }=-2.1V$$
(iii) $$C\rightarrow { C }^{ 2+ }+2e; \,\,\,\,{ E }^{ o }=-0.38V$$
(iv) $${ D }^{ -2 }\rightarrow { D }^{ - }+e; \,\,\,\,{ E }^{ o }=-0.59V\quad $$
What combination of two half cells would result in a cell with the largest potential?