Design the ticket ordering flow so customers get immediate confirmation when a seat is reserved.
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Correct answer: Send the seat reservation via HTTP POST to an Application Load Balancer that forwards to a Compute Engine managed instance group to process it..
Why this is the answer
The correct answer ensures immediate confirmation by directly processing the reservation. Sending an HTTP POST request to an Application Load Balancer (ALB) that forwards to a Compute Engine managed instance group (MIG) allows for synchronous processing and immediate response to the user. The MIG provides scalability and high availability to handle concurrent requests. Enqueueing in Cloud Tasks or publishing to Pub/Sub are asynchronous patterns, meaning the customer would not receive immediate confirmation as the processing happens later. Uploading to Cloud Storage and triggering Cloud Run is also an asynchronous pattern, typically used for batch processing or event-driven architectures where immediate feedback isn't critical.
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