(Solved): Which choice below represents a conjugate acid-base pair -that is, an acid and its conjugate base? ...

Which choice below represents a conjugate acid-base pair -that is, an acid and its conjugate base? \( \mathrm{HClO}_{4} \) and \( \mathrm{HClO}_{3} \) \( \mathrm{HCl} \) and \( \mathrm{HBr} \) \( \mathrm{NH}_{4}^{+1} \) and \( \mathrm{NH}_{3} \) \( \mathrm{H}_{3} \mathrm{O}^{+1} \) and \( \mathrm{OH}^{-1} \)