This AZ-900 practice question tests your understanding of describe azure management and governance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 company has a policy that all Azure resources must have an 'Owner' tag. They want to automatically add the 'Owner' tag with a value 'Default' to any resource created without it. Which Azure Policy effect should they use?
Append
Append adds the 'Owner' tag to resources during creation.
Modify
Why wrong: Modify can change existing properties but is more complex; append is simpler for adding tags.
Deny
Why wrong: Deny prevents creation, not add the tag.
Audit
Why wrong: Audit only logs non-compliance, does not add the tag.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Append
The Append effect is correct because it allows Azure Policy to add the 'Owner' tag with a value 'Default' to any resource that is created without that tag. Append works by adding specified fields (like tags) to the resource during creation or update, without blocking the operation. This ensures compliance with the tagging policy automatically, without denying the resource creation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Append
Why this is correct
Append adds the 'Owner' tag to resources during creation.
Related concept
Read the scenario before looking for a memorised answer.
Modify
Why it's wrong here
Modify can change existing properties but is more complex; append is simpler for adding tags.
Deny
Why it's wrong here
Deny prevents creation, not add the tag.
Audit
Why it's wrong here
Audit only logs non-compliance, does not add the tag.
Common exam traps
The trap here is that candidates often confuse Append with Modify, thinking Modify can also add tags, but Modify is designed for altering existing properties and requires a managed identity, while Append is the correct effect for adding missing fields like tags during resource creation.
Detailed technical explanation
Under the hood, the Append effect uses a policy rule that evaluates the resource during creation or update and, if the tag is missing, adds it via a 'details' block with the field 'tags.Owner' and the value 'Default'. This is a non-blocking operation that occurs before the resource is fully committed, ensuring the tag is present in the final resource state. A real-world scenario is when an organization uses Azure Policy to enforce tagging for cost tracking, and Append ensures all resources get a default tag without manual intervention.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
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FAQ
Describe Azure management and governance — This question tests Describe Azure management and governance — Read the scenario before looking for a memorised answer..
The correct answer is: Append — The Append effect is correct because it allows Azure Policy to add the 'Owner' tag with a value 'Default' to any resource that is created without that tag. Append works by adding specified fields (like tags) to the resource during creation or update, without blocking the operation. This ensures compliance with the tagging policy automatically, without denying the resource creation.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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