The correct statement when comparing DDR3 and DDR4 memory technologies is that DDR4 offers faster data transfer rates compared to DDR3. According to CompTIA Core 1 (220-1201) memory and hardware objectives, DDR4 was designed as the successor to DDR3 and provides several performance and efficiency improvements.
DDR3 memory typically operates at data transfer rates ranging from 800 MT/s to 2133 MT/s, while DDR4 starts at 2133 MT/s and can scale significantly higher depending on the module and platform. This increased transfer rate allows DDR4 to handle more data per second, improving overall system performance, especially in modern systems and multitasking environments.
Option B is incorrect because DDR4 achieves higher bandwidth, not DDR3. Option C is incorrect because DDR4 operates at a lower voltage (typically 1.2V) compared to DDR3 (typically 1.5V), making DDR4 more power efficient. Option D is also incorrect because DDR4 is better suited for low-power environments due to its reduced voltage requirements.
CompTIA emphasizes understanding RAM generations, including differences in speed, bandwidth, and power consumption, making DDR4's higher data transfer rates a key distinguishing factor.
References:CompTIA A+ Core 1 (220-1201) Official Study Guide - RAM Technologies, DDR Standards, and Performance Characteristics

Mobile Device Management (MDM) enables administrators to enforce controls on enterprise devices, such as restricting apps, ensuring compliance, and remotely managing security policies.
Why Not B (MFA): Multi-Factor Authentication secures user access but does not control device configurations.
Why Not C (VPN): VPN secures communication but does not enforce device controls.
Why Not D (SSL): SSL secures data in transit but does not provide device management.
CompTIA A+ Exam Reference: Core 2 (220-1102), Section 2.7, device management concepts.

CompTIA A+ explains that Wi-Fi issues at the edges of a building are typically caused by weak signal coverage, not client configuration. The recommended solution is to add additional wireless access points (APs) or mesh extenders to expand coverage and eliminate dead zones.
Enabling 5GHz would worsen the problem because 5GHz has shorter range and penetrates walls less effectively than 2.4GHz. Flushing DNS affects name resolution, not wireless signal strength. Upgrading the NIC to Wi-Fi 6 improves maximum throughput but still depends on sufficient signal, which the user does not have.
Additional APs ensure strong signal-to-noise ratio, consistent throughput, and stable roaming all solutions emphasized in the A+ wireless troubleshooting section. Therefore, option D is the correct and CompTIA- aligned fix.

Bluetooth audio issues are typically related to distance and signal strength, not internet connectivity or Wi-Fi access points. Bluetooth devices-especially headsets-generally have a limited effective range of around 10 meters (33 feet) for Class 2 Bluetooth, which is common in consumer laptops and headsets. When the user leaves the room and walks into adjacent offices, they are likely moving beyond the optimal Bluetooth range or passing through walls that weaken the signal.
CompTIA A+ highlights that Bluetooth uses low-power radio frequencies easily disrupted by physical obstructions, distance, and interference. Since the laptop remains stationary and the user moves, the headset becomes progressively further from the laptop, causing intermittent audio dropouts, stuttering, or loss of connection.
The number of APs (A) is irrelevant because the headset is not using Wi-Fi. Mesh mode (C) applies only to wireless AP-to-AP communication. The internet connection (D) is high-quality fiber and conference calls work fine when stationary, so the issue is not bandwidth or WAN throughput.
Thus, the most likely cause is that the user is moving in and out of Bluetooth range.

A hard disk drive (HDD), especially if it's older or nearly full, is the most common cause of slow startup times in laptops. HDDs are much slower than SSDs and can significantly bottleneck the boot process.
From CompTIA A+ 220-1101 Official Study Guide, Objective 4.1 - Troubleshoot common hardware problems:
"A slow startup or sluggish system performance is commonly due to a failing or fragmented hard disk drive (HDD). Replacing with an SSD can greatly improve boot times and overall system responsiveness." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 4: Troubleshooting PC Hardware CompTIA Exam Objectives 220-1101, Domain 4.1