The correct answer is the Cloud Storage trigger using the object finalized event. This is the right choice because Cloud Functions natively listens for the `google.storage.object.finalize` event, which fires precisely when a new object is written to a bucket or an existing object is overwritten, directly binding the function to the bucket without needing any intermediary service like Pub/Sub. On the Google Associate Cloud Engineer exam, this tests your understanding of event-driven architectures and the specific event types available for Cloud Storage triggers; a common trap is confusing the object finalized event with the object metadata update or delete events, which fire under different conditions. To remember this, think of the word “finalize” as the moment the object is fully committed to storage—once the upload completes, the function fires. A useful memory tip: “Finalize for first write, archive for older files, delete for removal.”
Google ACE Deploying and implementing a cloud solution Practice Question
This ACE practice question tests your understanding of deploying and implementing a cloud solution. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A Cloud Function must execute automatically every time a new object is written to a specific Cloud Storage bucket. Which trigger type should be configured for the function?
Why wrong: HTTP triggers fire only when a client makes an HTTP request to the function's URL — they don't respond to storage events.
B
Pub/Sub trigger
Why wrong: Pub/Sub triggers fire on messages published to a topic — not directly on storage uploads (unless storage notifications are separately configured to publish to Pub/Sub).
C
Cloud Storage trigger (object finalized event)
A Cloud Storage trigger on the `object.finalized` event fires the function immediately when a new object is created in the bucket — no intermediate service needed.
D
Cloud Scheduler trigger
Why wrong: Cloud Scheduler invokes functions on a time schedule — it cannot react to storage events.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cloud Storage trigger (object finalized event)
The Cloud Storage trigger (object finalized event) is the correct choice because Cloud Functions natively supports Cloud Storage events via the `google.storage.object.finalize` event type, which fires when a new object is created or an existing object is overwritten in a bucket. This trigger automatically invokes the function without requiring any intermediary service, directly binding the function to the bucket's notification system.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
HTTP trigger
Why it's wrong here
HTTP triggers fire only when a client makes an HTTP request to the function's URL — they don't respond to storage events.
✗
Pub/Sub trigger
Why it's wrong here
Pub/Sub triggers fire on messages published to a topic — not directly on storage uploads (unless storage notifications are separately configured to publish to Pub/Sub).
✓
Cloud Storage trigger (object finalized event)
Why this is correct
A Cloud Storage trigger on the `object.finalized` event fires the function immediately when a new object is created in the bucket — no intermediate service needed.
Related concept
Read the scenario before looking for a memorised answer.
✗
Cloud Scheduler trigger
Why it's wrong here
Cloud Scheduler invokes functions on a time schedule — it cannot react to storage events.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that Pub/Sub is required for Cloud Storage events, but Cloud Functions directly supports Cloud Storage triggers without needing an explicit Pub/Sub topic, making Option B a common distractor.
Detailed technical explanation
How to think about this question
Under the hood, Cloud Storage triggers use the Cloud Storage Pub/Sub notification mechanism, but the function is configured with a `google.storage.object.finalize` event type, which automatically creates and manages the underlying subscription. A subtle behavior is that the trigger fires for both new object uploads and object rewrites (e.g., metadata updates that change the generation number), which can cause unintended invocations if not accounted for in the function logic.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this ACE question in full detail.
Deploying and implementing a cloud solution — This question tests Deploying and implementing a cloud solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Cloud Storage trigger (object finalized event) — The Cloud Storage trigger (object finalized event) is the correct choice because Cloud Functions natively supports Cloud Storage events via the `google.storage.object.finalize` event type, which fires when a new object is created or an existing object is overwritten in a bucket. This trigger automatically invokes the function without requiring any intermediary service, directly binding the function to the bucket's notification system.
What should I do if I get this ACE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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