C is the answer.
https://learn.microsoft.com/en-us/power-virtual-agents/fundamentals-what-is-power-virtual-agents
Power Virtual Agents lets you create powerful AI-powered chatbots for a range of requests—from providing simple answers to common questions to resolving issues requiring complex conversations. Engage with customers and employees in multiple languages across websites, mobile apps, Facebook, Microsoft Teams, or any channel supported by the Azure Bot Framework.
To create a customer support solution that supports email, phone, and live chat channels, a chatbot is the most suitable AI solution. A chatbot can handle text-based interactions with customers across various channels, including email, phone, and live chat.
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