The correct option is A 1, 2 and 3
Initial consolidation or elastic compression due to expulsion of pore air or rapid dissipation of pore water with application of stress. This is significant in non-saturated clays, silts and granular soils. Primary consolidation due to slow expulsion of excess pore pressure over a period of time. Scondary consolidation due to viscous layer around particles resulting in rearrangement of particles.