Which two half reactions, when coupled, will make a galvanic cell that will produce the largest volt — Electrochemistry Chemistry Question

Which two half reactions, when coupled, will make a galvanic cell that will produce the largest voltage under standard conditions?
I. Cu²⁺(aq) + 2 e– → Cu(s) E° = +0.34 V
II. Pb²⁺(aq) + 2 e– → Pb(s) E° = –0.13 V
III. Ag⁺(aq) + e– → Ag(s) E° = +0.80 V
IV. Al³⁺(aq) + 3 e– → Al(s) E° = –1.66 V