The correct answer is to use the `depends_on` meta-argument. This explicit dependency tells Terraform to wait until the security group resource has been fully created before attempting to create the EC2 instance, directly solving the terraform resource creation order dependency problem. On the HashiCorp Terraform Associate TF-003 exam, this question tests your understanding of implicit versus explicit dependencies; while Terraform can often infer dependencies from attribute references, `depends_on` is the best practice when you need to force a specific order that Terraform cannot automatically detect. A common trap is confusing `depends_on` with `count` or `for_each`, which control how many resources are created, not the sequence of creation. Remember the memory tip: "If Terraform can't see the link, use `depends_on` to make it think."
TF-003 Understand Terraform basics Practice Question
This TF-003 practice question tests your understanding of understand terraform basics. 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 team uses Terraform to manage AWS resources. They want to ensure that a security group is created before an EC2 instance that references it. What is the best practice?
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
✓
Use `depends_on` meta-argument
Option A is correct because `depends_on` explicitly creates a dependency on the security group. Option B is wrong because `count` controls resource count, not dependencies. Option C is wrong because `for_each` is for iteration. Option D is wrong because provisioners are for post-creation actions. Option E is wrong because data sources read existing resources, not create dependencies.
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 `for_each` to iterate over resources
Why it's wrong here
`for_each` is for creating multiple resources, not ordering.
✗
Use `count` to create the security group first
Why it's wrong here
`count` does not enforce dependency ordering.
✗
Use `provisioner` to wait for the security group
Why it's wrong here
Provisioners run after resource creation, not before.
✓
Use `depends_on` meta-argument
Why this is correct
Correct: Explicit dependency ensures ordering.
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 data source to reference the security group
Why it's wrong here
Data sources read existing resources, they do not ensure creation order.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 practitioner preparing for the TF-003 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which TF-003 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Understand Terraform basics — This question tests Understand Terraform basics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use `depends_on` meta-argument — Option A is correct because `depends_on` explicitly creates a dependency on the security group. Option B is wrong because `count` controls resource count, not dependencies. Option C is wrong because `for_each` is for iteration. Option D is wrong because provisioners are for post-creation actions. Option E is wrong because data sources read existing resources, not create dependencies.
What should I do if I get this TF-003 question wrong?
Identify which TF-003 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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