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The best choice for streaming video content that requires high availability and geographical optimization is the Azure Content Delivery Network (CDN). Azure CDN is specifically designed to distribute content globally across multiple servers, ensuring that it is delivered to users from the nearest location. This minimizes latency and buffering, which is crucial for a seamless video streaming experience.

The CDN works by caching content in various edge locations around the world, which means that users can access the streamed video from a server that is physically closer to them, leading to improved performance and reliability. The service also provides functionalities such as dynamic site acceleration and the ability to scale to handle peak loads, making it an ideal solution for high-demand scenarios like video streaming.

In contrast, while other options like Azure App Service (both Isolated and Web Apps) might provide web hosting capabilities, they are not specifically optimized for content delivery. Azure Redis Cache serves as an in-memory database optimization tool rather than a content distribution service. Therefore, for the specific need of streaming video content efficiently, Azure CDN stands out as the most appropriate solution.