Which of the following reactions does a common alkaline battery, such as those used in portable tape players (think 1990s), utilize?

Question

Zn(s) + MgO(s) → ZnO(s) + Mg(s)
ZnO(s) + Mg(s) → Zn(s) + MgO(s)
2 Zn(s) + 2 MnO₂(s) → 2 ZnO(s) + Mn₂O₃(s)
Zn(s) + HgO(s) → Hg(l) + ZnO(s)