Consider the English sentence P: "Everyone is wearing a blue shirt." The negation of P can be expressed in logical symbols as which of the following? (We are using U = { all people} as our universal set.) a) O¬P: 3x, z is wearing a blue shirt b) OP: 3x, x is not wearing a blue shirt c) O¬P: Vx, x is wearing a blue shirt d) O¬P: Vx, x is not wearing a blue shirt

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