TheDo Not Disturbsetting in Windows Notification settings allows users to suppress all notification banners and sounds during presentations or video calls.
FromTravis Everett - All-in-One Exam Guide:
"Use Windows 'Do Not Disturb' to prevent notifications from interrupting full-screen apps like video conferencing."

The symptoms point to malicious or rogue content: frequent "security warning" pop-ups that push "tools" is a classic sign of scam/rogue apps, and the new fast battery drain suggests an unwanted process running in the background. The CompTIA objectives explicitly list mobile security symptoms such as "high number of ads,"
"fake security warnings," and "unexpected application behavior," which aligns with this scenario. On the browser side, Quentin Docter notes that if you continually receive pop-ups or overlays, "you may be infected with malware," and recommends scanning with antivirus/antimalware software. He also explains that clearing browsing data/cache is sometimes necessary to resolve browser-related problems and details how to clear cache/browsing data.
Because the user tapped the pop-up and then battery life worsened, the best practical fix is to remove the likely malicious application(s) (uninstall unknown apps) and clear browser cache to eliminate stored site data
/scripts fueling the pop-ups. A factory reset is a stronger last resort, but least disruptive remediation is A.

When Task Manager repeatedly fails to open, that's a strong red flag for system tampering-especially malware designed to block diagnostic and remediation tools. Quentin Docter explains that stealth malware attempts to avoid detection by "masking itself from applications" and can redirect commands around itself to avoid detection. That behavior fits the symptom of a core troubleshooting utility (Task Manager) not launching when an administrator needs it.
Docter also reinforces that the correct process in suspected malware cases begins with "identify and verify the malware symptoms," followed by containment and remediation steps. If a key system tool is blocked, that itself is a "verify symptoms" indicator that the system is compromised and needs malware-handling procedures.
The other choices don't explain the symptom well: a dev app running would not normally prevent Task Manager from launching; Windows Update set to manual wouldn't block Task Manager; and a moved pagefile might affect performance but not typically stop Task Manager from opening at all. Therefore, malware infection is the most likely cause.

The correct answer is A. Perform a factory reset, because the symptoms strongly indicate a serious mobile malware infection, potentially including spyware or a trojan installed from an unofficial app store. Random pop-ups, excessive data usage, blocked access to banking apps, and inability to update the OS are classic indicators that malicious software has gained deep system-level access.
According to the Quentin Docter - CompTIA A+ Complete Study Guide, mobile malware installed from unofficial sources can embed itself deeply into the operating system, sometimes gaining device administrator privileges. In such cases, standard remediation steps such as clearing cache or uninstalling apps may be ineffective.
The Travis Everett & Andrew Hutz - All-in-One Exam Guide explains that when a mobile device shows signs of persistent compromise-especially when core OS functions and security-sensitive applications are affected-the recommended first step is to perform a factory reset. This completely wipes user-installed applications and restores the device to a known-good state.
The Mike Meyers / Mark Soper Lab Manual reinforces that changing passwords is important after the device is secured, not before. Contacting support or clearing cache does not remove deeply embedded malware.
Therefore, to immediately address the security threat and regain control of the device, a factory reset is the most appropriate first action, making A the correct answer.

In a domain environment, printers are typically deployed via a print server. Users can browse available printers on the server and install them directly.
All-in-One Exam Guidementions:
"In a corporate domain, printers are managed via a centralized print server. Users can select the desired printer from the server's shared list."