Which linguistic device was specifically highlighted by researchers as the key factor in making Nike's 'Just Do It' slogan so effective and memorable?

Advertising slogans are carefully crafted linguistic tools designed to create brand recognition and emotional connections with consumers. They often employ rhetorical devices like alliteration, metaphor, and rhythm to make them more memorable. The most successful slogans become so embedded in our collective consciousness that they can influence language itself. This poll tests your knowledge about how language is strategically used in some of the world's most famous advertising campaigns.

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Imperative mood (direct command form)
Alliteration (repetition of consonant sounds)
Assonance (repetition of vowel sounds)
Synecdoche (using a part to represent the whole)