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In rudimentary yield-line slab estimates, why might a kinematic collapse curve serve only as an approximate upper-bound check?

Choices

(A) Optimistic yield mechanisms can inflate capacity versus safer lower-bound substantiation
(B) It duplicates service cracking limits for arbitrary live patterns
(C) Span proportions never alter plastic hinge layouts
(D) Service criteria vanish whenever ultimate narratives are drafted

Correct answer: (A)

Optimistic yield mechanisms can inflate capacity versus safer lower-bound substantiation

Upper-bound style yield patterns need conservative kinematics versus refined analyses.