Mobile Device Management (MDM) allows IT departments to enforce compliance controls, such as restricting the installation of unapproved software, on laptops and mobile devices.
Why Not A (EDR): Endpoint Detection and Response focuses on detecting and mitigating security threats, not compliance controls.
Why Not B (VPN): Virtual Private Networks provide secure connections but do not enforce software installation policies.
Why Not D (SaaS): Software as a Service refers to software delivery models and does not enforce compliance controls.
CompTIA A+ Exam Reference: Core 2 (220-1102), Section 2.7, device management and security.

Printers in SOHO environments must maintain a consistent IP address so devices can regularly locate them for scanning and printing tasks. CompTIA A+ emphasizes assigning static IPs to network printers to prevent address changes that occur with DHCP.
Laptops can remain DHCP clients because their address consistency is less critical. APIPA cannot communicate across networks and therefore should not be used. Assigning public IPs is incorrect and unsafe.
By giving the printer a static IP within the same subnet, all laptops can reliably access it, and the network remains organized and functional exactly as the A+ objectives recommend.

2.4GHz Wi-Fi signals have better penetration through walls and other obstacles compared to 5GHz and 6GHz. Lower frequency waves (like 2.4GHz) travel farther and are less absorbed by physical barriers.
From the CompTIA A+ 220-1101 Official Study Guide, Objective 2.5 - Compare and contrast wireless networking protocols:
"The 2.4GHz frequency band offers greater range and better penetration through walls and obstacles than higher frequencies like 5GHz and 6GHz. Higher frequencies provide faster speeds but are more easily absorbed by walls." NFC (Near Field Communication) is not a Wi-Fi technology and works only over very short distances (a few centimeters).
Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 2: Wireless Networking CompTIA Exam Objectives 220-1101, Domain 2.5

Containers provide lightweight virtualization, ideal for deploying microservices because they are isolated, portable, and require fewer resources than traditional VMs.
From CompTIA A+ 220-1101 Official Study Guide, Objective 3.7 - Virtualization and cloud computing:
"Containers package applications and their dependencies, making them ideal for running microservices efficiently and independently." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 3: Cloud and Virtualization CompTIA Exam Objectives 220-1101, Domain 3.7

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.