Identify the sentence that employs the idiom 'a leopard cannot change its spots' correctly:
Despite his attempts at rehabilitation, he proved to be a 'leopard that cannot change its spots.'
Due to its inability to adapt, the leopard was forced to conceal itself in the shadows.
Baroque art features strong contrasts, while Rococo art prefers more subtle transitions
Baroque art is generally larger in scale than Rococo art

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