The correct option is Azure Translator.

Azure Translator provides a dedicated language detection endpoint and real time translation capabilities that are designed for low latency text processing. The service can detect the language of short messages instantly with a single API call and it scales to handle high throughput so developers can route messages to moderation and localization flows without added delay.

Azure Speech Services is focused on audio and speech processing rather than direct text language detection for live messaging. It is the right choice when you need speech to text or speech recognition features but it is not the dedicated text detection service for this scenario.

Google Cloud Translation API can perform language detection but it is a Google Cloud product and not the Azure service requested by this question. The exam expects the Azure offering that best fits the instantaneous text routing requirement.

Azure Language Service offers broader natural language understanding and text analytics capabilities and it may include language identification features. For a live messaging pipeline that needs the fastest, dedicated detection and translation endpoints the exam answer favors Azure Translator as the appropriate Azure service.

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