The correct choice is that the script include is in a scoped application while the client script is in a different scope, because a client-callable script include must be in global scope for GlideAjax to function properly. When a script include is marked as client-callable, it is only automatically accessible to client-side code if it resides in the global scope; scoped script includes are isolated and require explicit exposure via the ‘Accessible from’ property, otherwise the client-side GlideAjax API cannot locate the script include, resulting in the “GlideAjax is not defined” error. On the ServiceNow Certified Application Developer exam, this question tests your understanding of scope isolation and client-server communication—a common trap is assuming that marking a script include as client-callable within a scoped application makes it available to all client scripts, when in fact the global scope requirement is strict. Remember the memory tip: “Client-callable equals global-accessible; if it’s scoped, it’s not exposed.”
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 creates a script include with client-callable true. The script include is used in a client script to validate a field. However, when the client script runs, it throws an error that GlideAjax is not defined. What is the most likely issue?
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 script include is a global scope but the client script is in a scoped application.
Option C is correct because when a script include is marked as client-callable, it must be in the global scope to be accessible from a client script via GlideAjax. If the script include is in a scoped application and the client script is in a different scope (or even the same scope), the GlideAjax call will fail because scoped script includes are not automatically available to client-side code unless explicitly exposed via the 'Accessible from' property. The error 'GlideAjax is not defined' indicates the client-side API cannot find the script include, which is a scope isolation issue.
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 script include is not marked as 'Client-callable'.
Why it's wrong here
If it were not client-callable, the error would be about access, not 'GlideAjax is not defined'.
✗
The client script is running in a UI policy instead of a client script.
Why it's wrong here
UI policies also can use client scripts; the error would not be about GlideAjax definition.
✓
The script include is a global scope but the client script is in a scoped application.
Why this is correct
In scoped apps, GlideAjax may not be available for global script includes unless explicitly allowed.
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.
✗
The client script is not using the correct GlideAjax syntax.
Why it's wrong here
Syntax errors would likely cause a different error message.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ServiceNow often tests the misconception that marking a script include as client-callable is sufficient for it to be used from any client script, ignoring the scope isolation requirement that client-callable script includes must be in the global scope.
Detailed technical explanation
How to think about this question
GlideAjax is a client-side API that creates an XMLHttpRequest to the server, invoking a client-callable script include. The script include must be in the global scope because scoped applications have their own namespace and client-side code cannot directly reference scoped script includes unless they are explicitly made accessible via the 'Accessible from' property set to 'All applications' or the client script is in the same scope. Under the hood, the GlideAjax processor looks up the script include by name in the global scope; if it's scoped, the lookup fails and the GlideAjax constructor throws a ReferenceError.
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 practitioner preparing for the SNOW-CAD 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 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 script include is a global scope but the client script is in a scoped application. — Option C is correct because when a script include is marked as client-callable, it must be in the global scope to be accessible from a client script via GlideAjax. If the script include is in a scoped application and the client script is in a different scope (or even the same scope), the GlideAjax call will fail because scoped script includes are not automatically available to client-side code unless explicitly exposed via the 'Accessible from' property. The error 'GlideAjax is not defined' indicates the client-side API cannot find the script include, which is a scope isolation issue.
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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Question Discussion
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