Consider the following natural language sentence: I'm neither angry nor upset. Which answer is a translation of this natural language sentence into formal logic? a.) A = I'm angry. U = I'm upset. ¬A ∨ ¬U b.) A = I'm not angry. U = I'm not upset. ¬A ∨ ¬U c.) A = I'm angry. U = I'm upset. ¬(A ∨ U) d.) A = I'm angry. U = I'm upset. ¬(A ∧ U)