Question 115 of 1,020

Mobile Device Application Support →hardMultiple ChoiceObjective-mapped

iOS Update Causes Banking App Crash

This 220-1201 practice question tests your understanding of mobile device application support. 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 user reports that after a recent iOS update, their banking app crashes every time they try to log in. Other apps work fine. The app was working before the update. What is the most likely cause and solution?

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.

A
The iOS update corrupted the app's data; reinstalling the app will fix it.
Why wrong: While reinstalling can fix data corruption, the root cause is more likely an API incompatibility that only an app update can resolve.
B
The banking app is not compatible with the new iOS version and needs an update from the developer.
OS updates often require app updates to maintain compatibility; checking for an app update is the correct first step.
C
The user's account has been locked due to multiple failed login attempts.
Why wrong: Account lockout would show an error message, not cause the app to crash immediately upon login attempt.
D
The iOS update changed the device's security settings, blocking the app.
Why wrong: Security settings changes would typically block the app entirely, not cause a crash only during login.

Full breakdown with real-world context →

Quick Answer

The answer is that the banking app is incompatible with the new iOS version and requires an update from the developer. This is because iOS updates often deprecate older APIs or introduce stricter security protocols, which can cause apps built on previous frameworks to crash when attempting sensitive operations like login. On the CompTIA A+ Core 1 220-1201 exam, this scenario tests your understanding of OS and application compatibility—a common troubleshooting trap is to blame the device hardware or network, when the real issue is the app’s lack of support for the new OS. A helpful memory tip: think of the OS update as a new lock on the door; the old key (the app) won’t work until the locksmith (the developer) cuts a new one.

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

The banking app is not compatible with the new iOS version and needs an update from the developer.

The most likely cause is that the banking app is not yet compatible with the new iOS version. After a major iOS update, apps that rely on specific APIs or frameworks (e.g., Keychain, WebKit, or Secure Enclave) may break if the developer has not updated the app to support the new OS. The solution is for the developer to release an update that targets the new iOS SDK, and for the user to install that update from the App Store.

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 iOS update corrupted the app's data; reinstalling the app will fix it.
Why it's wrong here
While reinstalling can fix data corruption, the root cause is more likely an API incompatibility that only an app update can resolve.
✓
The banking app is not compatible with the new iOS version and needs an update from the developer.
Why this is correct
OS updates often require app updates to maintain compatibility; checking for an app update is the correct first step.
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 user's account has been locked due to multiple failed login attempts.
Why it's wrong here
Account lockout would show an error message, not cause the app to crash immediately upon login attempt.
✗
The iOS update changed the device's security settings, blocking the app.
Why it's wrong here
Security settings changes would typically block the app entirely, not cause a crash only during login.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The 220-1201 exam often tests the concept that app crashes after an OS update are most commonly due to app-OS incompatibility, not data corruption or account issues, and the trap is that candidates mistakenly attribute the crash to corrupted data or security settings changes.

Trap categories for this question

Command / output trap
Account lockout would show an error message, not cause the app to crash immediately upon login attempt.

Detailed technical explanation

How to think about this question

Under the hood, iOS apps are compiled against a specific SDK version. When a new iOS version deprecates or removes APIs (e.g., UIWebView replaced by WKWebView, or changes to Keychain accessibility), an older app that calls those deprecated APIs may encounter unrecognized selector exceptions or memory access violations, leading to a crash. In real-world scenarios, financial apps often use certificate pinning or custom TLS implementations that may break with updated network security requirements in iOS, causing crashes during the authentication handshake.

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 220-1201 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.

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FAQ

Questions learners often ask

What does this 220-1201 question test?

Mobile Device Application Support — This question tests Mobile Device Application Support — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The banking app is not compatible with the new iOS version and needs an update from the developer. — The most likely cause is that the banking app is not yet compatible with the new iOS version. After a major iOS update, apps that rely on specific APIs or frameworks (e.g., Keychain, WebKit, or Secure Enclave) may break if the developer has not updated the app to support the new OS. The solution is for the developer to release an update that targets the new iOS SDK, and for the user to install that update from the App Store.

What should I do if I get this 220-1201 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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