The answer is that the logical error is using OR instead of AND in the validation condition. This is a classic boolean logic mistake where the OR operator (||) allows the validation to pass if either the length check or the number check is true, rather than requiring both to be true simultaneously. In the given scenario, the password "abc123" contains a number, so the regular expression test returns true, and the OR condition short-circuits to pass validation even though the password is only six characters long. On the CompTIA ITF+ FC0-U61 exam, this tests your understanding of how logical operators control program flow in conditional statements, a common trap where developers mistakenly use OR when they intend to enforce multiple requirements. A reliable memory tip is to think of AND as a strict gatekeeper that demands every condition be satisfied, while OR is a lenient doorman who lets you in if just one condition is met.
FC0-U61 Software Development Concepts Practice Question
This FC0-U61 practice question tests your understanding of software development concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 web application uses a JavaScript function to validate user input on a registration form. The function checks that the password is at least 8 characters long and contains a number. When a user submits the form with a password "abc123", the validation passes even though the password has only 6 characters. The developer examines the code and finds that the function uses the condition: if (password.length >= 8 || /\d/.test(password)). Which logical error is causing this bug?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The condition uses OR instead of AND.
The condition uses OR (||) instead of AND (&&), so the validation passes if either condition is true. "abc123" has a number, so it passes. The regular expression is correct, length check is appropriate, and the function is called.
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 condition uses OR instead of AND.
Why this is correct
Using OR means only one condition needs to be true; with AND both must be true.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The function is not called.
Why it's wrong here
If the function weren't called, no validation would occur; but validation passes for this input, so it is called.
✗
The regular expression is incorrect.
Why it's wrong here
The regex /\d/ correctly checks for a digit.
✗
The length check is incorrect because it uses >= instead of >.
Why it's wrong here
>= is correct for 'at least 8' because it includes 8.
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 FC0-U61 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 FC0-U61 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.
Software Development Concepts — This question tests Software Development Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The condition uses OR instead of AND. — The condition uses OR (||) instead of AND (&&), so the validation passes if either condition is true. "abc123" has a number, so it passes. The regular expression is correct, length check is appropriate, and the function is called.
What should I do if I get this FC0-U61 question wrong?
Identify which FC0-U61 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: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This FC0-U61 practice question is part of Courseiva's free CompTIA 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 FC0-U61 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.