The correct answer is A. Check for malicious applications, because excessive data usage, device overheating, and rapid battery drain are classic indicators of mobile malware or spyware running in the background.
According to the Quentin Docter - CompTIA A+ Complete Study Guide, malicious applications can continuously transmit data, mine cryptocurrency, or monitor user activity, all of which cause increased network usage and battery consumption-even when the device appears idle.
The Travis Everett & Andrew Hutz - All-in-One Exam Guide emphasizes that the first step in mobile troubleshooting is identifying whether unauthorized or malicious apps are present. Reviewing installed applications and running a mobile security scan can quickly confirm the root cause.
The Mike Meyers / Mark Soper Lab Manual explains that disabling networks or enabling airplane mode only masks symptoms temporarily and does not remove malware. Factory resets are effective but should be used after confirming malware or if other remediation steps fail.
Because the symptoms strongly suggest malicious background activity, the most appropriate first action is to check for malicious applications, making A the correct answer.

Keychainis the built-in macOS utility that manages and stores credentials, including passwords and certificates.
According toQuentin Docter - CompTIA A+ Complete Study Guide:
"Keychain Access in macOS is used for managing and storing passwords securely, similar to credential managers in Windows."

The correct answer is D. Smishing, which is a form of phishing attack conducted via SMS text messages. The key indicators in this scenario are the unexpected text message and the embedded link prompting the user to reset a password. These attacks rely on urgency and fear to trick users into clicking malicious links or providing credentials.
According to the Quentin Docter - CompTIA A+ Complete Study Guide, smishing attacks often impersonate legitimate organizations such as banks, IT departments, or service providers. The attacker claims that an account action is required, such as resetting an expired password, to prompt immediate user response.
The Travis Everett & Andrew Hutz - All-in-One Exam Guide explains that smishing is distinct from other phishing variants based on delivery method. Vishing uses voice calls, spear phishing targets specific individuals via email, and whaling targets high-level executives. Since this attack is delivered via text message, it is classified as smishing.
The Mike Meyers / Mark Soper Lab Manual reinforces that modern attackers increasingly use SMS because users often trust text messages more than emails. This makes smishing a highly effective and common attack vector.
Because the attack uses SMS with a malicious link, smishing is the correct answer.

Authenticator apps, such as Google Authenticator or Microsoft Authenticator, can be configured to sendpush notificationsto users for approval when logging in. This is a form of multi-factor authentication.
FromAll-in-One Exam Guide:
"Push-based two-factor authentication uses an authenticator app to send a notification to a mobile device. The user must approve the login attempt in real time, ensuring the request is valid."

Adding ten high-end graphics/animation desktops can dramatically increase the electrical load on the room's existing circuits. High-performance CPUs and GPUs draw substantially more wattage than typical office PCs, and that wattage translates into higher current (amperage) on the circuit. Mike Meyers' Lab Manual explains the relationship V × A = W and warns that wiring and circuits have amperage ratings; pushing too much current can overheat wiring and trigger safety devices. It also explains that circuit breakers are rated for a specified amperage and will open (trip) when overloaded to prevent overheating and damage. Therefore, before deployment, the technician should calculate expected power draw per system and ensure the desktops are distributed across sufficient circuits (or that electrical upgrades are made) to avoid repeated breaker trips, overheating risks, and downtime. While temperature and humidity matter for environmental control, the question is specifically about introducing multiple power-hungry workstations, making circuit power consumption the most critical planning factor for safe, stable operation. This aligns with A+ operational
/environmental concepts around proper power handling and avoiding overload conditions.
References: Quentin Docter - CompTIA A+ Complete Study Guide (Safety/Environmental concerns; power- handling focus); Travis Everett & Andrew Hutz - CompTIA A+ All-in-One Exam Guide (V×A=W; circuit breaker behavior under overload); Mark Soper - Mike Meyers' A+ Lab Manual (amperage ratings; circuit breakers trip when overloaded)