Client virtualization involves installing an application on a server and enabling multiple users to run the application simultaneously via virtualized sessions. This eliminates the need for individual installations on local machines.
Why Not B (Software as a Service): SaaS delivers software over the internet and does not require local installations but is managed by a third party, not the organization itself.
Why Not C (Sandboxing): Sandboxing is for isolating applications for security testing, not for concurrent user access.
Why Not D (Embedded software): Embedded software is installed on hardware devices, not shared across multiple users.
CompTIA A+ Exam Reference: Core 1 (220-1201), Section 4.2, virtualization concepts.

If newly installed RAM is not fully recognized, the most likely cause is incorrect installation or incompatible slots. Reseating or reinstalling the RAM modules in the correct slots can quickly resolve the issue without extra cost.
From CompTIA A+ 220-1101 Official Study Guide, Objective 3.2 - Install and configure PC components:
"If memory is not detected, check installation and reseat modules. Ensure they are placed in the correct, matched slots for dual-channel operation." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 3: Memory Installation CompTIA Exam Objectives 220-1101, Domain 3.2

The first security step after deploying a new router is to change the default administrative password. Default credentials are well known and pose a security risk if left unchanged.
From CompTIA A+ 220-1101 Official Study Guide, Objective 2.3 - Secure a wireless network:
"Always change default administrative credentials before further configuration to prevent unauthorized access." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 2: Wireless Security CompTIA Exam Objectives 220-1101, Domain 2.3

A hybrid cloud combines on-premises infrastructure with public cloud services. One significant advantage is that it allows organizations to keep sensitive data in a private environment to meet regulatory or data residency requirements, while still utilizing the scalability and cost-efficiency of the public cloud for other workloads. This ensures compliance with legal mandates about data location.
Reference: "CompTIA A+ Complete Study Guide" by Quentin Docter - Chapter 8, "Virtualization and Cloud Computing", page 488. Also supported in CompTIA A+ Exam Objectives220-1201under section 4.1.

A VLAN (Virtual Local Area Network) is the correct solution because it logically separates devices into different broadcast domains on the same physical switching infrastructure. In CompTIA A+ Core 1 (220-
1201), VLANs are described as a way to segment a network for security, performance, and management-for example, isolating departments like Accounting and Customer Service so their traffic is separated. Devices assigned to different VLANs cannot communicate directly at Layer 2; communication between VLANs requires a Layer 3 device (such as a router or a Layer 3 switch) using inter-VLAN routing and appropriate access control. This effectively prevents unnecessary broadcast traffic from crossing department boundaries and helps enforce separation policies.
A VPN is used to create an encrypted tunnel over an untrusted network (commonly for remote access or site- to-site connectivity), not for internal departmental segmentation. DNS resolves hostnames to IP addresses and does not isolate networks. DHCP automatically assigns IP configuration (IP address, gateway, DNS servers), but it does not provide segmentation by itself. Therefore, implementing VLANs is the best way to separate the two departments' networks.