Which of the following sols is positively charged?

A positive charge is created in the silver iodide ($\mathrm{AgI}$) when a diluted solution of potassium iodide ($\mathrm{KI}$) is added to a diluted solution of silver nitrate. The absorption of silver ions ($\$\mathrm{Ag} + \$$) from the dispersion media onto the precipitate produced by silver iodide is what causes the development of positive charge sol ($\mathrm{AgI}$).