Question: deffitions : A wff us unstaisfiable if every interpretation is a counter model. otherwise the wff is sarisfiable. What is false a . A wff

deffitions : A wff us unstaisfiable if every interpretation is a counter model. otherwise the wff is sarisfiable. What is false a. A wff can be valid and satisfiable b. A wff can be valid and unstisfiable c. A wff can be invalid and satisfiable d. A wff can be invalid and unsatisable

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