The first steps that the technician should perform are A. Check the version of the HDMI cable and B. Check the input source.
A possible cause of the problem is that the HDMI cable is not compatible with the 4K resolution of the monitor. HDMI cables have different versions that support different features and bandwidths. For example, HDMI 1.4 supports up to 4K at 30 Hz, while HDMI 2.0 supports up to 4K at 60 Hz1. The technician should check the version of the HDMI cable and make sure it matches the specifications of the monitor and the desktop.
Another possible cause of the problem is that the monitor is not set to the correct input source. The input source is the option that allows the monitor to switch between different video signals from different ports, such as HDMI, DVI, VGA, or DisplayPort2. The technician should check the input source and make sure it is set to HDMI, since that is how the desktop is connected to the monitor. The input source can usually be changed using the buttons or menu on the monitor itself2.

A repetitive clicking noise coming from a laptop is usually a sign of a failing hard disk drive (HDD), which is a type of storage device that uses spinning platters and moving heads to read and write data. A failing HDD can also cause severe delays in input and output operations, as well as data loss or corruption. The technician should replace the HDD with a new one or upgrade it to a solid state drive (SSD), which is another type of storage device that uses flash memory and has no moving parts. Reference: https://partners.comptia.org/docs
/default-source/resources/a-core-series-combined-content-guide (page 24)

The screen rotation is locked. If a user's touch-screen tablet is having an issue with screen orientation, it could be due to screen rotation being locked in device settings.
If the screen rotation is locked, the touch-screen tablet will not rotate the screen when the device is turned.
This can usually be unlocked in the settings or by pressing a specific key combination. References:
https://www.howtogeek.com/254132/how-to-enable-screen-rotation-on-windows-10/

To adjust the VLAN configuration, the technician needs to configure the switch. VLANs are configured on switches to segment network traffic logically, even if the devices are connected to the same physical network.
By adjusting the VLAN settings on the switch, the technician can ensure that the sales department has access to the marketing department's network resources.
* C. Switch: VLANs are configured on switches to logically separate or combine network segments.
Why the other options are incorrect:
* A. Network card: A network card is a hardware component that connects a device to a network, but it does not configure VLANs.
* B. Patch panel: A patch panel is used to organize and manage network cables but does not play a role in VLAN configuration.
* D. Server: A server may host resources, but VLANs are managed at the switch level.
* E. Hub: A hub is a basic networking device that simply forwards traffic; it cannot be used to configure VLANs.
This falls under the Networking domain in the CompTIA A+ Core 1 exam.

The Domain Name System (DNS) is responsible for translating domain names into IP addresses. By blocking malicious sites from resolving correctly, the DNS server is able to prevent the user from accessing those sites. Therefore, the DNS server setting on the user's router needs to be changed to enable this functionality123.