The correct answer is A. Toner probe.
A toner probe is an electronic test instrument that can help trace wires and locate the port where a printer is connected on a patch panel. A toner probe consists of two parts: a tone generator and a tone detector. The tone generator sends a signal through the cable, and the tone detector picks up the signal at the other end. By using a toner probe, a technician can identify which port on the patch panel corresponds to the printer cable.
A loopback plug is a device that can test the functionality of a network port by sending and receiving signals from the same port. A loopback plug is not useful for locating ports on a patch panel.
A cable tester is a device that can verify the integrity and continuity of a cable by checking for open, short, or miswired connections. A cable tester can also measure the length and resistance of a cable. A cable tester is not useful for locating ports on a patch panel.
A Wi-Fi analyzer is a software or hardware tool that can monitor and analyze wireless networks by scanning for available channels, signal strength, security settings, and other parameters. A Wi-Fi analyzer is not useful for locating ports on a patch panel.
Reference: comptia A+ Core 1 - Hardware And Network Troubleshooting - ExamGuides.com

Allow listing is a security technique that allows only specific IP addresses or domains to access a network or a service. By adding the office IP address as an exception, the company can prevent two-factor authentication from being triggered when users are connected to the office Wi-Fi, since the office network is considered trusted. This way, users will only be prompted for two-factor authentication when working outside of the office, which enhances security.
References: The following web search results provide more information about allow listing and two-factor authentication:
What Is Two-Factor Authentication (2FA)? | Microsoft Security: This article explains the concept of two-factor authentication, its benefits, and its methods.
Change your two-step verification method and settings - Microsoft Support: This article shows how to manage your security verification methods and settings for your work or school account, including how to turn on two-factor verification prompts on a trusted device.
2FA Directory: This website lists all the sites that support two-factor authentication, and the methods they use.

Step by Step Detailed Comprehensive Explanation with All CompTIA References:
Analysis of the Problem:
Switching to the 5GHz frequency improves speed but decreases range and penetration through walls compared to 2.4GHz.
Users experience degraded performance likely due to poor coverage at the 5GHz range.
Option Evaluation:
A: Select a different channel: Useful for interference resolution but not coverage improvement. Incorrect.
B: Switch the Wi-Fi back to 2.4GHz frequency: This downgrades the network speed, which isn't a preferred solution. Incorrect.
C: Upgrade the wireless drivers on the users' devices: Unlikely to resolve coverage issues. Incorrect.
D: Add more access points for better coverage: Improves coverage in areas where 5GHz struggles. Correct.
Reference: Domain 2.5 of the 220-1101 objectives emphasizes understanding wireless network configurations.

A technician is working on a help desk ticket for a user who wants the filament replaced in a 3-D printer. To remove the old filament and load the new one, the technician should preheat the nozzle to melting temperature. After the nozzle is heated, the technician should withdraw the filament and remove the spool.
Then, cut a sharp angle on the end of the new strand, and push it along until resistance is felt.

The issue of video but no audio on a projector in a conference room can be resolved by utilizing an HDMI connection between the PC and the projector. HDMI supports both video and audio signals and is commonly used to connect a PC to a projector for presentations. Changing the input on the projector to VGA, changing the output on the PC to DVI, or modifying the projector's refresh rate will not resolve the issue. References:
CompTIA A+ Certification Exam: Core 1 - Objective 2.5