According to the Microsoft Azure AI Fundamentals (AI-900) learning content, Language Understanding Intelligent Service (LUIS) is part of Azure Cognitive Services used to interpret the meaning or intent behind a user's input in natural language. When a user says, "Call me back later," the system must recognize that the user intends for a call to be scheduled or delayed-this is not just about translating or analyzing text but understanding intent and relevant entities.
LUIS allows developers to train models to identify intents (such as ScheduleCall, CancelMeeting, etc.) and extract key entities (like names, times, or actions) from text inputs. It is typically integrated with conversational agents such as Azure Bot Service, enabling more natural, human-like interactions.
Other options do not fit the scenario:
* Translator Text (A) translates text between languages but does not interpret meaning.
* Text Analytics (B) performs sentiment analysis, key phrase extraction, and named entity recognition, but it doesn't identify intent.
* Speech (C) converts spoken language to text or text to speech but doesn't interpret what the words mean.
Therefore, for understanding user intent such as "Call me back later," the correct AI service is D. Language Understanding (LUIS).