The correct approach is to use Secret Manager. This is because Secret Manager is Google Cloud’s dedicated service for securely storing and accessing sensitive data like API keys, passwords, and certificates, providing encryption at rest and in transit, fine-grained IAM controls, and versioning. When deploying a Cloud Function, you can reference a secret by name at deployment time, ensuring the secret value is never exposed in source code, environment variable definitions, or configuration files. On the Google Professional Cloud Developer exam, this scenario tests your understanding of secure secret injection versus common pitfalls like hardcoding secrets in environment variables or using Cloud Storage, which lack the same access control and audit logging. A frequent trap is assuming that environment variables set during deployment are inherently secure—they are not, as they can appear in logs or deployment metadata. Memory tip: think “Secret Manager, not secret string”—if you see a secret in plain text, it’s a trap.
PCD Building and testing applications Practice Question
This PCD practice question tests your understanding of building and testing applications. 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 developer needs to ensure that environment variables containing secrets are securely passed to a Cloud Function during deployment. Which approach should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Secret Manager
Option C is correct because Secret Manager is the recommended Google Cloud service for securely storing and accessing secrets such as API keys, passwords, and certificates. It provides encryption at rest and in transit, fine-grained IAM access control, and versioning, allowing the Cloud Function to reference secrets by name at deployment time without exposing them in source code or configuration files.
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.
✗
Store in source code
Why it's wrong here
Hardcoding secrets is insecure and should never be done.
✗
Use Cloud KMS
Why it's wrong here
Cloud KMS is for encryption keys, not a secrets management service; Secret Manager is the appropriate choice.
✓
Use Secret Manager
Why this is correct
Secret Manager provides secure storage, versioning, and fine-grained access control, and is the best practice for secrets.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use runtime environment variables
Why it's wrong here
Runtime environment variables are visible in the Cloud Console and logs, not suitable for secrets.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Cloud KMS (a key encryption service) with Secret Manager (a secret storage service), or assume runtime environment variables are secure because they are not in source code, ignoring that they are stored in plain text in the deployment metadata.
Detailed technical explanation
How to think about this question
Under the hood, Secret Manager integrates with Cloud Functions via the `--set-secrets` flag during deployment, which binds a secret version to an environment variable. The secret value is decrypted at function invocation time using the Secret Manager API, and the function's runtime service account must have the `secretmanager.secretAccessor` role. A real-world scenario is a function that needs a database password: using Secret Manager allows rotating the password by creating a new secret version and updating the function's binding without redeploying the code.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Building and testing applications — This question tests Building and testing applications — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Secret Manager — Option C is correct because Secret Manager is the recommended Google Cloud service for securely storing and accessing secrets such as API keys, passwords, and certificates. It provides encryption at rest and in transit, fine-grained IAM access control, and versioning, allowing the Cloud Function to reference secrets by name at deployment time without exposing them in source code or configuration files.
What should I do if I get this PCD 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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