Which linguistic technique did Apple deliberately use in naming its 'AirPods' to create a specific brand perception?

In the world of retail and marketing, language plays a crucial role in brand identity. Slogans, taglines, and linguistic choices can make or break a brand's connection with consumers. This trivia tests your knowledge about famous linguistic branding strategies that have shaped consumer behavior and product recognition. How well do you understand the power of words in the retail landscape?

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Sound symbolism (using 'Air' to suggest lightness and 'Pod' for containment, creating a phonaesthetic effect that suggests wireless, lightweight technology)
Retronyming (creating a new term to differentiate from traditional 'wired' headphones, similar to how 'acoustic guitar' was retronymed after electric guitars)
Portmanteau (combining 'Air' and 'Pods' to create a new word, primarily focused on the blending technique rather than sound associations)
Proprietary eponym (developing a unique term designed to become generic for the entire product category, like 'Kleenex' for tissues)