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Let L\mathcal{L}L be a first-order language with a single binary relation symbol RRR. Let ψ\psiψ be the first-order sentence: ∀x¬R(x,x)∧∀x∀y∀z(R(x,y)∧R(y,z)  ⟹  R(x,z))∧∀x∃yR(x,y)\forall x \neg R(x, x) \land \forall x \forall y \forall z (R(x, y) \land R(y, z) \implies R(x, z)) \land \forall x \exists y R(x, y)∀x¬R(x,x)∧∀x∀y∀z(R(x,y)∧R(y,z)⟹R(x,z))∧∀x∃yR(x,y) Which of the following structures is a model of ψ\psiψ?