Which linguistic technology innovation first allowed Amazon's Alexa to process and understand natural language queries for shopping, launching in 2014?

The intersection of linguistics and e-commerce has created fascinating innovations in how we shop online. Natural Language Processing (NLP) has transformed product search, recommendation systems, and customer service. This poll tests your knowledge about a groundbreaking linguistic technology that revolutionized online retail and continues to shape how consumers interact with e-commerce platforms worldwide.

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Amazon Neural Machine Translation (ANMT)
Natural Language Understanding (NLU) with Deep Learning
Automatic Speech Recognition (ASR) with Recurrent Neural Networks
Contextual Semantic Analysis (CSA)