What is the purpose of using constitutive equations in soil behavior studies? To relate stresses, strains, and time in order to mathematically tre...

What is the purpose of using constitutive equations in soil behavior studies?

To relate stresses, strains, and time in order to mathematically treat problems involving soil behavior under applied loads.
To separate deformation from rupture in foundation and containment projects.
To analyze the deformation and rupture problems simultaneously using sophisticated numerical methods.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and II are correct.
e) I and III are correct.