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 selected

Question

Options

• AUpload the seat reservation to a Cloud Storage bucket, which triggers an event to the backend
• BSubmit the seat reservation in an HTTP POST request to an Application Load Balancer.
• CAdd the seat reservation to a Cloud Tasks queue, which triggers Workflows to process the seat
• DPublish the seat reservation to a Pub/Sub topic. Configure the backend service to subscribe to

• A
  4% (1)
• B
  79% (19)
• C
  13% (3)
• D
  4% (1)

Explanation

The correct answer is B because the requirement for 'immediate confirmation' demands a synchronous request/response pattern. An HTTP POST to an Application Load Balancer is a synchronous call - the backend processes the reservation and returns a response (success or failure) within the same HTTP transaction, allowing the frontend to instantly confirm to the customer whether the seat was secured. Options A (Cloud Storage trigger), C (Cloud Tasks queue), and D (Pub/Sub topic) are all asynchronous patterns: the reservation is placed into a queue or bucket, processed later by a downstream service, and there is no direct return path to send an immediate response to the waiting user. Asynchronous messaging is valuable for decoupling and resilience, but it requires a separate notification mechanism (e.g., WebSocket, polling) to inform the user of the outcome - it cannot provide the immediate in-request confirmation the question requires.

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