What do Atterberg Limits represent?

Water contents at certain soil behavior thresholds

Soil strength when wet and dry

Maximum and minimum amount of water soil can hold

Minimum and maximum sieve sizes soil can pass through

$2$

Which of the following is an Atterberg limit used for soil dassification?

Plasticlimit

Cohesion limit

Sticky limit

Hydrometer test

What is the definition of the plastic index $($PI$)?$

Difference between the liquid limit and plastic limit

Index for scaling the natural water content of a soil

The water content at which soil behaves like a brittle solid

Strength difference between an intact and remolded soil sample