The superlative form 'salubérrimo' is incorrect in Spanish compared to the standard form 'saludabilísimo.'
The incorrect superlative in the options provided is d) Saludable - salubérrimo. In Spanish, the correct superlative form of 'saludable' should be 'saludabilísimo,' not 'salubérrimo.' The other options exhibit the correct superlative forms based on standard rules of forming superlatives in Spanish.
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