What is the primary purpose of Azure Bot Service?

Correct answer: Create and deploy conversational AI applications using Azure Cognitive Services

Option C is correct because Azure Bot Service provides an integrated development environment for building, testing, and deploying intelligent conversational bots, leveraging Azure Cognitive Services for natural language understanding, speech, and other AI capabilities. Option A is wrong because hosting web servers is the role of services such as Azure App Service or Azure Virtual Machines, not Bot Service. Option B is wrong because user authentication is handled by Azure Active Directory and related identity services, not Bot Service. Option D is wrong because relational data storage is the domain of Azure SQL Database or similar offerings, not Bot Service.