Google ACE Deploying and implementing a cloud solution Practice Question
This ACE practice question tests your understanding of deploying and implementing a cloud solution. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 developer wants to deploy a Cloud Function that processes images uploaded to a Cloud Storage bucket. The function should be triggered automatically when an object is created. What is the best practice for setting up this trigger?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a Cloud Function with a Cloud Storage trigger and specify the bucket and event type
Option B is correct because Cloud Functions natively supports Cloud Storage triggers via the `google.storage.object.finalize` event type, which fires when a new object is created in the specified bucket. This is the simplest and most reliable approach, as it eliminates the need for intermediate services and ensures low-latency, event-driven invocation directly from the storage layer.
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.
✗
Use a Pub/Sub topic and a push subscription to invoke the Cloud Function
Why it's wrong here
While possible, it adds complexity; a direct Cloud Storage trigger is simpler and recommended.
✓
Create a Cloud Function with a Cloud Storage trigger and specify the bucket and event type
Why this is correct
Cloud Functions natively support Cloud Storage triggers; this is the simplest approach.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a Compute Engine instance to watch the bucket and call the function
Why it's wrong here
Using a VM adds overhead and is not a serverless best practice.
✗
Set up a Cloud Scheduler job to periodically scan the bucket and invoke the function
Why it's wrong here
Periodic scanning is inefficient and not real-time; event-driven triggers are preferred.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that Pub/Sub is required for all event-driven triggers, but Cloud Storage has a direct integration with Cloud Functions that avoids the overhead of an additional messaging layer.
Detailed technical explanation
How to think about this question
Under the hood, Cloud Functions uses Eventarc to route Cloud Storage events (like `google.storage.object.finalize`) to the function. The trigger is configured with a specific bucket and event type, and the function receives a `CloudEvent` containing metadata such as the object name, bucket name, and generation number. A subtle behavior is that the trigger only fires for newly created objects, not for overwrites or metadata changes, unless you explicitly configure the `google.storage.object.metadataUpdate` event type.
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: Create a Cloud Function with a Cloud Storage trigger and specify the bucket and event type — Option B is correct because Cloud Functions natively supports Cloud Storage triggers via the `google.storage.object.finalize` event type, which fires when a new object is created in the specified bucket. This is the simplest and most reliable approach, as it eliminates the need for intermediate services and ensures low-latency, event-driven invocation directly from the storage layer.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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