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Undrained (A) and Undrained (B) are the recommended options for modeling the undrained behavior (applying effective stress analysis). Stiffness parameter inputs for Undrained (A) and Undrained (B) are in terms of effective stiffness; the bulk modulus of water is calculated accordingly. PLAXIS provides the SoilTest feature to test the soil model/parameters using commonly used laboratory test → This does NOT substitute the real laboratory test. Mohr-Coulomb model is certainly limited for capturing the real behavior of soil in undrained path → Advanced soil model should be considered (e.g. hardening soil).