The answer is that the UI policy is configured to run on desktop only. This is the most likely cause because UI policies in ServiceNow include separate checkboxes for "Run on desktop" and "Run on mobile," and by default, a new UI policy is set to run exclusively on desktop. When a developer creates a UI policy without explicitly enabling the "Run on mobile" setting, the policy’s logic—such as making a field mandatory when another field equals 'Yes'—will execute only on the desktop interface, leaving the mobile app unaffected. On the ServiceNow Certified Application Developer CAD exam, this scenario tests your understanding of UI policy mobile compatibility and the common oversight of platform-specific execution settings. A frequent trap is assuming UI policies apply universally across all interfaces, but the exam emphasizes that mobile and desktop environments are treated as separate contexts. Remember the memory tip: "Desktop default, mobile manual"—if you don’t check the mobile box, the policy stays on the desktop track.
SNOW-CAD Core Application Development Practice Question
This SNOW-CAD practice question tests your understanding of core application development. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 is troubleshooting a UI policy that sets a field to mandatory when another field equals 'Yes'. The UI policy works on desktop but not on the mobile app. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The UI policy is set to 'Run on desktop' only.
Option D is correct because UI policies have a 'Run on desktop' and 'Run on mobile' checkbox. By default, a new UI policy is set to run on desktop only. If the developer did not explicitly check the 'Run on mobile' option, the policy will not execute on the mobile app, causing the mandatory behavior to be absent on mobile while working on desktop.
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.
✗
The UI policy is set to 'Run on mobile' but the script is incompatible.
Why it's wrong here
Incompatible script would likely cause an error, not silent failure.
✗
The field is not available on the mobile form.
Why it's wrong here
If the field is not present, the policy might not apply, but the most common reason is the run option.
✗
The mobile app uses a different table.
Why it's wrong here
Mobile app typically uses the same table but a different user interface.
✓
The UI policy is set to 'Run on desktop' only.
Why this is correct
UI policies have separate run options for desktop and mobile.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ServiceNow often tests the distinction between 'Run on desktop' and 'Run on mobile' settings, trapping candidates who assume UI policies automatically apply to all platforms or who confuse this with field availability or table differences.
Detailed technical explanation
How to think about this question
UI policies in ServiceNow are evaluated client-side via the GlideForm (g_form) API. The 'Run on mobile' checkbox controls whether the policy's client script is included in the mobile app's UI context. If unchecked, the script is never injected into the mobile form's HTML, so no mandatory or visibility changes occur. This is distinct from UI scripts or ACLs, which have separate mobile controls.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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.
Core Application Development — This question tests Core Application Development — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The UI policy is set to 'Run on desktop' only. — Option D is correct because UI policies have a 'Run on desktop' and 'Run on mobile' checkbox. By default, a new UI policy is set to run on desktop only. If the developer did not explicitly check the 'Run on mobile' option, the policy will not execute on the mobile app, causing the mandatory behavior to be absent on mobile while working on desktop.
What should I do if I get this SNOW-CAD 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This SNOW-CAD practice question is part of Courseiva's free ServiceNow certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SNOW-CAD exam.
Question Discussion
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