Which of the Following Cell Reactions Would Require the Use $\to$

Which of the following cell reactions would require the use of an inert electrode?

A) Co(s) + 2Ag⁺(aq) $\to$ Co²⁺(aq) + 2Ag(s)
B) 3Sr(s) + 2Au³⁺(aq) $\to$ 3Sr²⁺ + 2Au(s)
C) 3Rb⁺(aq) + Al(s) $\to$ 3Rb(s) + Al³⁺(aq)
D) Ba(s) + 2MnO₂(s) + 2NH₄⁺(aq) $\to$ Ba²⁺(aq) + Mn₂O₃(s) + 2NH₃(aq) + H₂O(l)
E) Sr(s) + 2Ag⁺(aq) $\to$ 2Ag(s) + Sr²⁺(aq)