Which linguistic phenomenon was deliberately employed in naming the digital assistant 'Alexa' by Amazon?

In the world of marketing and branding, companies carefully select product names that leverage linguistic principles to create memorable, appealing, and marketable identities. These names often employ techniques like phonaesthetics (pleasing sound combinations), morphology (word formation), and semantic associations to trigger specific consumer responses. This poll tests your knowledge about how language science influences brand naming strategies in the global marketplace.

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X-plosiveness (starts with a plosive consonant for memorability)
Sonority (contains open vowels that resonate well when spoken)
Fricative avoidance (contains no fricatives that might cause speech recognition errors)
Voiceless sibilant absence (lacks s/sh/ch sounds that can be misinterpreted by voice recognition)