In Wi-Fi, the 2.4GHz band contains 14 total channels (depending on region), but only channels 1, 6, and 11 are considered non-overlapping in most countries. CompTIA A+ highlights the importance of selecting these channels to minimize interference, especially in environments with multiple wireless networks or access points.
The 2.4GHz band is narrower than 5GHz, causing adjacent channels to overlap significantly. Using channels
1, 6, and 11 prevents overlap and reduces signal interference, improving performance and stability.
5GHz (B) has many non-overlapping channels and does not use the 1/6/11 scheme. The 6GHz band (C) is part of Wi-Fi 6E and uses entirely different channel planning. The 60GHz band (D) supports short-range high- speed connections like WiGig, not traditional Wi-Fi channels.
Therefore, the 2.4GHz band is the correct answer.

F-type connectors are commonly used to terminate coaxial cables in cable internet, cable TV, and satellite connections.
From CompTIA A+ 220-1101 Official Study Guide, Objective 3.1 - Network cables and connectors:
"F-type connectors are used for coaxial cable terminations in cable modem and TV installations." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 3: Networking Cables and Connectors CompTIA Exam Objectives 220-1101, Domain 3.1

NVMe (Non-Volatile Memory Express) drives commonly use the M.2 interface and provide the highest performance for SSDs.
From CompTIA A+ 220-1101 Official Study Guide, Objective 3.2 - Storage devices:
"NVMe drives connect via the M.2 slot and provide the fastest data transfer rates available for storage devices." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 3: Storage Technologies CompTIA Exam Objectives 220-1101, Domain 3.2

If flipping the cable helps but the problem is isolated to this device (not others of the same type), the most likely cause is a dirty or damaged charging port on the device itself. Dirt or debris inside the port can prevent a good electrical connection, causing the cable to work intermittently.
Reference: CompTIA A+ Certification Exam Core 1 Objectives - Domain 1.0 Mobile Devices - Objective
1.6: Troubleshoot common mobile device issues.

For the highest possible stability, the best power-supply choice is a redundant power supply. In CompTIA A+ Core 1 (220-1201) hardware concepts, redundant PSUs are used in systems where uptime and reliability are critical. A redundant PSU configuration typically includes two power supply units operating together (often in a hot-swappable bay). If one PSU fails, the other continues supplying power, allowing the workstation to remain operational and preventing unexpected shutdowns that could interrupt CAD work or corrupt data. This directly matches the requirement for maximum stability.
A UPS improves resilience to power loss and brownouts by providing battery backup and line conditioning, but it is not a power supply type and doesn't protect against the PSU itself failing. A surge protector helps guard against voltage spikes, but it also does not ensure system operation if the PSU fails. A modular PSU mainly improves cable management and airflow by allowing detachable cables; it can be convenient and neat, but it does not inherently increase stability compared with redundancy. Therefore, the most stability-focused PSU option is Redundant.