CLF-C02 Cloud Technology and Services Practice Question
A company needs to convert text documents into natural-sounding speech in multiple languages for an audiobook application. Which AWS service provides this capability?
⚠ Common exam trap
Many exam-takers confuse Amazon Polly (text-to-speech) with Amazon Transcribe (speech-to-text), as both deal with speech but in opposite directions, leading candidates to mistakenly choose Transcribe when the requirement is to generate speech from text.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon Polly
Amazon Polly is a managed service that turns text into lifelike speech using deep learning technologies, supporting multiple languages and voices. It is specifically designed for text-to-speech (TTS) conversion, making it the correct choice for generating natural-sounding audio for an audiobook application.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon Transcribe
Why it's wrong here
Amazon Transcribe is an automatic speech recognition (ASR) service that delivers speech-to-text (STT) functionality, converting audio or video recordings into written text. It cannot synthesize speech from text; its primary purpose is to generate transcripts, captions, and searchable text from spoken content. Because document narration requires generating audio output from text input, Transcribe operates in the reverse direction and is therefore unsuitable for this use case.
- ✗
Amazon Translate
Why it's wrong here
Amazon Translate is a neural machine translation service that translates text from one language to another, operating exclusively on written text inputs and outputs. It does not process audio or synthesize speech, so it cannot read a document aloud in a spoken format. While it could theoretically translate the text of a document into another language, neither the source nor the output would be audio narration, making it irrelevant to a text-to-speech scenario.
- ✓
Amazon Polly
Why this is correct
Amazon Polly is AWS's fully managed text-to-speech (TTS) service that converts text into lifelike speech using advanced deep-learning models. It supports dozens of languages and many standard, neural, and generative voice styles, producing natural-sounding audio that can be saved as files (e.g., MP3, OGG) for use in document narration, podcasts, or accessibility applications. This aligns exactly with the requirement to convert textual content into spoken audio, making Polly the correct service for this scenario.
- ✗
Amazon Lex
Why it's wrong here
Amazon Lex is a service for building conversational interfaces, such as chatbots and virtual assistants, using automatic speech recognition (ASR) and natural language understanding (NLU) to interpret user intents. While Lex can recognize spoken input and respond with text, it does not inherently synthesize audio output; it typically relies on a separate TTS service like Amazon Polly to convert text responses into speech. Since the use case is simply converting a whole document into narration, Lex's chatbot framework adds unwanted complexity and doesn't directly provide text-to-speech synthesis.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CLF-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CLF-C02 exam.