The correct answer is Immersive Reader.

Immersive Reader offers adjustable reading tools such as text spacing line focus syllable highlighting and read aloud which help students with dyslexia and other processing differences read more comfortably. These tools are designed to change the visual presentation and provide audio support so learners can tailor the experience to their needs.

Immersive Reader is available as part of Azure Cognitive Services and can be embedded in web and mobile applications with simple SDKs and REST APIs so the learning portal can add the reader friendly features without rebuilding its content pipeline.

Text Analytics is focused on extracting sentiment key phrases entities and language detection and it does not provide interactive reading or formatting tools for learners.

Custom Vision is used for image classification and object detection and it does not offer features to improve text readability or provide reading aids for dyslexia.

Speech service provides speech to text and text to speech capabilities and it can read content aloud but it does not provide the on page adjustable reading interface features like text spacing line focus and syllable highlighting that Immersive Reader provides.

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