The issue is that new employees are not able to print to the main networked copiers from their workstations after Switch 3 was added to the stack. Looking at the port configurations for Switch 3, we can see that the ports for printers (Ports 13-24) are shut down.
A . Enable the printer ports on Switch 3: This should be done because, as per the configuration shown in the image, these ports are currently shut down. Enabling them would restore connectivity for printing.
E . Reconfigure the VLAN on the printer ports on Switch 3: The VLAN for printers is set to 80 on Switch 3 while it is set to 60 on Switches 1 and 2. Changing VLAN of printer ports on Switch 3 to match with other switches (VLAN60) will ensure that they are all in the same broadcast domain and can communicate effectively.
The duplex settings do not need reconfiguration as they are already set to full duplex across all switches which facilitates efficient two-way communication.
Reference:
CompTIA Network+ N10-008 Certification Study Guide, Chapter 3: Network Devices, page 115-116 CompTIA Network+ Certification Exam Objectives, Domain 2: Network Implementations, Objective 2.1: Given a scenario, install and configure the appropriate networking devices, Sub-objective: Configure switch ports Ace Your CompTIA Network+ Exam: Explore Top Study Resources, Section: CompTIA Network+ Certification Kit: Exam N10-008 6th Edition

* The question asks about the best wireless standard for a WLAN project that involves MU-MIMO and dual-band frequencies.
* The answer is not A, because 802.11ac is a wireless standard that supports MU-MIMO, but only operates on the 5GHz frequency band, which does not meet the project requirement of compatibility with 2.4GHz clients.
* The answer is not C, because 802.11g is a wireless standard that operates on the 2.4GHz frequency band, but does not support MU-MIMO, which is a key feature for improving connection performance in high-density areas.
* The answer is not D, because 802.11n is a wireless standard that operates on both 2.4GHz and 5GHz frequency bands, but only supports SU-MIMO (Single-User Multiple-Input Multiple-Output), which is less efficient and scalable than MU-MIMO for multiple concurrent connections.
* The answer is B, because 802.11ax is a wireless standard that supports MU-MIMO and operates on both
2.4GHz and 5GHz frequency bands, which meets the project requirements of compatibility and performance. 802.11ax is also known as Wi-Fi 6, and it offers higher data rates, lower latency, and better energy efficiency than previous wireless standards.
References:
* : CompTIA Network+ N10-008 Study Guide, Chapter 3: Network Components, Section 3.1: Network Devices, p. 121
* : CompTIA Network+ N10-008 Study Guide, Chapter 3: Network Components, Section 3.2: Wireless Technologies, p. 134
* : CompTIA Network+ N10-008 Study Guide, Chapter 3: Network Components, Section 3.2: Wireless Technologies, p. 136
* : CompTIA Network+ N10-008 Study Guide, Chapter 3: Network Components, Section 3.2: Wireless Technologies, p. 139

Explanation
A captive portal is a web page that requires users to authenticate before they can access the internet. If the session time-out configuration is too short, users may experience intermittent internet connectivity and have to reconnect using the web authentication process each time. The network administrator can verify the session time-out configuration on the captive portal settings and adjust it if needed. References: CompTIA Network+ Certification Exam Objectives Version 2.0 (Exam Number: N10-006), Domain 1.0 Network Architecture, Objective 1.8 Explain the purposes and use cases for advanced networking devices.