In the actual ionic form of strong-acid/strong-base neutralization, the spectator ions are—

• a$\mathrm{Na^+}$ and $\mathrm{Cl^-}$
• b$\mathrm{H^+}$ and $\mathrm{OH^-}$
• c$\mathrm{Na^+}$ and $\mathrm{OH^-}$
• d$\mathrm{H^+}$ and $\mathrm{Cl^-}$