The requirement is to convert written customer notifications into natural-sounding spoken audio. This is speech synthesis, also known as text to speech.
Microsoft’s Azure Speech documentation describes text to speech as a capability that converts text into natural-sounding synthesized speech. Therefore, for playing written notifications over a phone system, the correct Azure Speech capability is speech synthesis.
Why the other options are incorrect:
A. speaker recognition identifies or verifies speakers by voice.
C. speech recognition converts spoken audio into text.
D. speech translation translates spoken audio between languages.
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