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CLF-C02 practice question: AI, machine learning and analytics (1 of 3)

Cloud Technology and Services A free question from our original CLF-C02 practice exam. Try it, then open the answer to see why each option is right or wrong.

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A bank is building a voice assistant for its phone helpline.

It must turn callers' spoken words into text, and read replies back to callers in a natural-sounding voice, using managed AI services with no model training.

Which TWO services should it use? (Choose two.)

Choose two answers.

  1. A. Amazon Transcribe, which converts speech into text
  2. B. Amazon Comprehend, which finds sentiment and key phrases in text
  3. C. Amazon Translate, which converts text between languages
  4. D. Amazon Rekognition, which analyzes images and video
  5. E. Amazon Polly, which converts text into lifelike speech
Show the answer and explanation

Answers: A, E

  • A. Right: Amazon Transcribe is a fully managed speech-to-text service, so it turns callers' speech into text without the bank building a model. Learn more: Amazon Transcribe (opens in a new tab)
  • B. Wrong: Comprehend analyzes existing text for sentiment, entities and key phrases. It does not convert speech to text or create spoken replies.
  • C. Wrong: Translate converts text between languages. It is useful for multilingual callers, but it does not turn speech into text or produce audio.
  • D. Wrong: Rekognition analyzes images and video. It has no role in converting speech or producing spoken audio.
  • E. Right: Amazon Polly turns text into lifelike speech, so it can read the assistant's replies aloud to callers. Learn more: Amazon Polly (opens in a new tab)

Explanation

Transcribe converts speech to text and Polly converts text to lifelike speech, which covers both halves of the voice assistant. Comprehend, Translate and Rekognition each work on text in another way, or on images and video, and none of them handles the speech conversion.

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