Which one of the following statements

$\rightarrow$ Viscosity of hydrophilic sol $>$ viscosity of $\mathrm{H}_{2} \mathrm{O}$

$\rightarrow$ Hydrophilic sol is more stable so can't be easily coagulated.

$\rightarrow$ Hydrophilic sols are reversible sols.

$\rightarrow$ No electrolytes are required to stabilise hydrophilic sol.