According to some political pundits, a person who is radical ($R$) is electable ($E$) if he/she is conservative ($C$), but otherwise is not electable.
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Which of the following are correct representations of this assertion?
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$(R\land E)\iff C$
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$R{:\;{\Rightarrow}:\;}(E\iff C)$
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$R{:\;{\Rightarrow}:\;}((C{:\;{\Rightarrow}:\;}E) \lor \lnot E)$
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Which of the sentences in (a) can be expressed in Horn form?
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