CompTIA A+ teaches that vertical lines on scanned or copied documents but not printed documents indicate a dirty or smudged scanner glass or ADF glass strip. Dust, ink smears, or debris create a line because the scanning sensor repeatedly passes over the same contaminated area.
If printing works normally, internal printer components such as the transfer roller or pickup rollers are not at fault. Maintenance kits apply to internal wear components like rollers, belts, or fusers not scanning artifacts.
Cleaning the scanner glass or ADF strip directly addresses this common problem. The A+ exam frequently includes troubleshooting questions about print vs. scan artifacts, and this scenario is a classic example.
Therefore, the correct solution is to clean the glass bed (or ADF strip).

APrivate Cloudis operated solely for a single organization. It ishosted on-premises or in a dedicated off-site data center, giving the company full control over data, security, and compliance often hosted in theorganization's own local data center.
Option B (Public):Hosted by third-party providers and shared by multiple clients.
Option C (Hybrid):Combines private and public cloud resources.
Option D (Community):Shared by several organizations with similar goals.
CompTIA A+ Core 1 Exam Objective Reference:
Objective 4.1: Compare and contrast cloud computing concepts.

An older HDMI cable version may not support 4K resolution. For 4K output, both the device and the cable must support HDMI 2.0 or higher.
From CompTIA A+ 220-1101 Official Study Guide, Objective 3.1 - Display troubleshooting:
"Ensure the correct version of HDMI cable is used for high-resolution outputs like 4K. Older cables may be limited to 1080p." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 3: Display and Video CompTIA Exam Objectives 220-1101, Domain 3.1

B . PAN (Personal Area Network):
A PAN is a network established between devices in close proximity, such as between a smartphone and a Bluetooth headset.
Bluetooth technology is specifically designed for short-range communication, making it a type of PAN.
Incorrect Options:
A . MAN (Metropolitan Area Network): A MAN covers a city or metropolitan area and is not relevant to Bluetooth connections.
C . SAN (Storage Area Network): A SAN is used for large-scale data storage, unrelated to Bluetooth connections.
D . WAN (Wide Area Network): A WAN spans large geographical areas (e.g., the internet) and is not relevant to this scenario.
Key Takeaway: Bluetooth connections, such as those between a headset and a device, create a Personal Area Network (PAN).

To add additional wired network devices in a simple and cost-effective manner, the best solution is an unmanaged switch. CompTIA A+ explains that unmanaged switches require no configuration, provide instant port expansion, and operate using plug-and-play functionality. This makes them ideal for home offices where the user wants more Ethernet ports without dealing with administrative overhead or complex setup.
An unmanaged switch automatically forwards traffic using MAC addresses, expanding the network without altering IP configuration or security settings. It is inexpensive compared to other networking equipment and requires no firmware updates, VLAN management, or routing knowledge.
A DSL modem or cable modem provides internet service but does not increase the number of available network ports beyond the single LAN port commonly offered. A firewall controls traffic but does not expand physical connectivity. Therefore, neither modem nor firewall options meet the requirement of adding more wired devices.
Thus, the unmanaged switch is the simplest, cheapest, and most practical choice for expanding connectivity in a home office environment.