The correct statements among the following are

The charge on the diffused layer of AgI colloidal solution by the addition of few drops of dilute aqueous solution of KI to an aqueous solution of $$\text{AgNO}_3$$ is negative

The charge on the diffused layer of AgI colloidal solution by the addition of few drops of dilute aqueous solution of $$\text{AgNO}_3$$ to an aqueous solution of KI is positive

When the ionic strength of a colloidal solution is increased, thickness of the double layer is increased, and the colloid gets precipitated

When the ionic strength of a colloidal solution is increased, thickness of the double layer is decreased, and the colloid gets precipitated