You are a developer that works for a local concert venue. Customers use your company's website to purchase tickets for events. You need to provide customers with immediate confirmation when a…

Question

Options

• AAdd the seat reservation to a Cloud Tasks queue, which triggers Workflows to process the seat
• BPublish the seat reservation to a Pub/Sub topic. Configure the backend service to use Eventarc to
• CUpload the seat reservation to a Cloud Storage bucket, which triggers an event to a Cloud Run
• DSubmit the seat reservation in an HTTP POST request to an Application Load Balancer.

• A
  2% (1)
• B
  10% (5)
• C
  4% (2)
• D
  84% (42)

Explanation

Immediate confirmation requires a synchronous request-response pattern. Submitting the seat reservation as an HTTP POST to an Application Load Balancer processes the request end-to-end and returns a success or failure response to the client in the same HTTP transaction-the customer sees confirmation instantly. All other options (A: Cloud Tasks, B: Pub/Sub, C: Cloud Storage event) introduce asynchronous messaging, meaning the client receives an acknowledgment that the message was queued-not that the seat was actually reserved. Asynchronous patterns are appropriate for background work, not for real-time seat reservation confirmation where a customer needs to know immediately if they got the seat.

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