Which reagent or reagents, together with the required conditions, will oxidise chlorine, $\text{Cl}_2$, to a compound in which chlorine has the +5 oxidation state?
- A$\text{AgNO}_3 (aq)$ followed by $\text{NH}_3 (aq)$ at room temperature
- Bconcentrated $\text{H}_2\text{SO}_4$ at room temperature
- Ccold dilute $\text{NaOH} (aq)$
- Dhot concentrated $\text{NaOH} (aq)$