The correct answer is C. RDP (Remote Desktop Protocol), because RDP is the default remote access technology for Windows servers. It allows technicians to remotely connect to the graphical desktop environment of a Windows server to verify services, logs, and system status.
According to the Quentin Docter - CompTIA A+ Complete Study Guide, RDP is built into Windows operating systems and is commonly used by administrators to manage Windows servers and workstations. It provides full access to the desktop, making it ideal for checking whether services such as IIS (Internet Information Services) are running properly.
The Travis Everett & Andrew Hutz - All-in-One Exam Guide explains that while SSH is commonly used for Linux and network devices, Windows servers typically rely on RDP for administrative access. VNC is a third-party remote desktop solution and is not enabled by default on Windows systems.
The Mike Meyers / Mark Soper Lab Manual reinforces that SPICE is primarily used in virtualized environments and is not a standard Windows remote access tool.
Because the technician needs to verify a Windows web server's operational status using a built-in method, RDP is the most appropriate and likely technology, making C the correct answer.

These symptoms strongly indicatemalware infectionor a malicious app running in the background. The first action should be torun a malware scanto identify and remove malicious components.
FromQuentin Docter - CompTIA A+ Complete Study Guide:
"If a mobile device is overheating and the battery drains rapidly after installing an app, this could point to malware. Begin by scanning the device with a mobile anti-malware application."

3G networks generally do not provide the bandwidth required for seamless HD video streaming. With only two signal bars and a 3G connection, the mobile device likely cannot maintain the necessary data throughput, resulting in timeouts or buffering failures. This is a classic symptom of insufficient network speed or signal strength.
A). Lack of Wi-Fi may contribute, but the root cause is the low mobile bandwidth, not the Wi-Fi state.
B). A website subscription lapse would return an account error, not a timeout.
D). Full device storage can affect downloads but not streaming from the internet.
Reference:
CompTIA A+ 220-1102 Objective 3.3: Troubleshoot mobile OS and application issues.
Study Guide Section: Connectivity and network performance issues on mobile devices

Mobile OS updates can sometimes cause compatibility issues with specific apps, including corporate email clients. The most likely resolution is to check for and apply an update to the affected application, especially if it hasn't been updated to support the latest OS version.
B). Registering with MDM might be required for access but wouldn't address app crashes due to incompatibility.
C). A third-party client might help, but it's not the best first step if the default app is expected to work.
D). Clearing the cache can help resolve some minor issues, but updating the app directly addresses compatibility concerns.
Reference:
CompTIA A+ 220-1102 Objective 3.3: Troubleshoot mobile OS and application issues.
Study Guide Section: App compatibility and mobile software updates

Smishing (SMS phishing) is a type of social engineering attack where attackers send fraudulent text messages to trick users into revealing sensitive information or downloading malware. These messages often impersonate banks, delivery services, or official institutions to lure the victim into clicking malicious links.
A). Impersonation is an in-person or voice-based tactic.
B). Vishing refers to voice phishing over phone calls.
C). Spear phishing is a targeted email-based phishing method.
Reference:
CompTIA A+ 220-1102 Objective 2.3: Compare and contrast social engineering techniques.
Study Guide Section: Smishing as a type of phishing via SMS or mobile messaging.