Stability and stress classification control questions

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(1) Regarding the description of stability, which of the following statements is correct? ( ) A. If a structure is in a stable state, it means that no plastic deformation has occurred in that structure. B. Stability can be divided into elastic stability and plastic stability. C. As long as the load range is below the stable load, the structure remains stable. D. The loss of structural stability indicates that a ratchet effect has occurred in the structure. (2) Regarding the 3S criterion, which of the following statements is correct? ( ) A. The 3S criterion is simple to implement and always ensures safety by being conservative. The B.3S criterion restricts the primary plus secondary stress intensity. The evaluation of the C.3S criterion uses design loads. D. The 3S criterion should take the load factor K into account. (3) The combined primary and secondary stress intensity cannot exceed 3Sm, True False