For testing alkalinity for a water sample, first phenolphthalein indicator is added. The water remains colorless. However, when a few drops of methyl orange is added to the sample, the color turns yellow. As per these observations, the correct choice is
- Absence of $\mathrm{CO}_{3}{ }^{2-}$ and/or $\mathrm{HCO}_{3}{ }^{-}$but the presence of $\mathrm{OH}^{-}$ions in the sample
- Presence of $\mathrm{CO}_{3}{ }^{2-}$ and/or $\mathrm{HCO}_{3}{ }^{-}$but the absence of $\mathrm{OH}^{-}$ions in the sample
- Absence of $\mathrm{CO}_{3}{ }^{2-}, \mathrm{HCO}_{3}{ }^{-}$and $\mathrm{OH}^{-}$ions in the sample
- Presence of $\mathrm{CO}_{3}{ }^{2-}, \mathrm{HCO}_{3}{ }^{-}$and $\mathrm{OH}^{-}$ions in the sample
