Which of the following is a multimolecular colloid?

Which one of the following sols acts as a lyophilic colloid?

Lyophilic sols are more stable than lyophobic sols because:

Identify the example of zero-dimensional $(0D)$ nanostructure from the following.

Preparation of Lyophobic sols by chemical method involves

The Tyndall effect is observed only when the following conditions are satisfied $:$
$1$. The diameter of the dispersed particles is much smaller than the wavelength of the light used.
$2$. The diameter of the dispersed particle is not much smaller than the wavelength of the light used.
$3$. The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude.
$4$. The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.