Quick Answer
The answer is a business rule, because it is the only option that runs server-side and can enforce validation logic before an update is committed to the database. When you need server-side validation to prevent an update based on a related record’s status, a business rule with the “when to run” condition set to “before” or “async” can query the related table and abort the update using the `current.setAbortAction(true)` method. On the ServiceNow Certified Application Developer exam, this question tests your understanding of where server-side logic belongs versus client-side scripts, which can be bypassed. A common trap is choosing a client script or UI policy, but remember: any validation that must be enforced regardless of the client’s request must live on the server. ACLs handle permissions, not data validation. Memory tip: “Business rules are the bouncers at the server door—they check the ID before the record gets in.”
This SNOW-CAD practice question tests your understanding of application development using servicenow studio. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 implement a server-side validation that prevents update to a record if a related record's status is 'Closed'. Where should this logic be placed?
ACL
Why wrong: ACLs control read/write access, not validation logic.
Client script
Why wrong: Client scripts run in the browser and can be circumvented.
UI policy
Why wrong: UI policies are client-side and primarily for UI behavior, not server-side validation.
Business rule
Business rules execute on the server and can abort transactions based on conditions.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Business rule
Option A is correct because a business rule runs server-side when a record is updated and can enforce the validation before the update occurs. Client scripts and UI policies are client-side and can be bypassed. ACLs are for access control, not validation.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
ACL
Why it's wrong here
ACLs control read/write access, not validation logic.
Client script
Why it's wrong here
Client scripts run in the browser and can be circumvented.
UI policy
Why it's wrong here
UI policies are client-side and primarily for UI behavior, not server-side validation.
Business rule
Why this is correct
Business rules execute on the server and can abort transactions based on conditions.
Related concept
Standard ACLs match source addresses.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SNOW-CAD ACL questions on filtering logic and placement.
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FAQ
Application development using ServiceNow Studio — This question tests Application development using ServiceNow Studio — Standard ACLs match source addresses..
The correct answer is: Business rule — Option A is correct because a business rule runs server-side when a record is updated and can enforce the validation before the update occurs. Client scripts and UI policies are client-side and can be bypassed. ACLs are for access control, not validation.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SNOW-CAD ACL questions on filtering logic and placement.
Standard ACLs match source addresses.
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Last reviewed: Jun 24, 2026
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