Switches operate at the data link layer (Layer 2) of the OSI model and make decisions based on MAC addresses. Hubs, on the other hand, operate at the physical layer (Layer 1) and simply repeat the signals they receive to all connected devices without any filtering or decision-making.
Reference:
Networking Devices - N10-008 CompTIA Network+ : 2.1

The best security measure to implement when removing a computer from a cubicle is to remove the employee's network access. This will prevent the employee from accessing any network resources or data from the computer, as well as prevent any unauthorized users from using the computer to access the network. Removing the employee's network access can be done by deleting or disabling the user account, revoking the credentials, or changing the permissions.
The other options are not as effective or necessary as removing the employee's network access. They are:
* Disabling DHCP on the computer being removed will prevent the computer from obtaining an IP address from the network, but it will not prevent the computer from using a static IP address or accessing the network through another device.
* Placing the switch port in a private VLAN will isolate the computer from other devices on the network, but it will not prevent the computer from accessing the network through another port or device.
* Applying a firewall rule to block the computer's IP address will prevent the computer from communicating with the network, but it will not prevent the computer from changing its IP address or accessing the network through another device.
Reference
1: CompTIA Network+ N10-008 Cert Guide - O'Reilly Media
2: Network+ (Plus) Certification | CompTIA IT Certifications
3: 10 Ways to Secure Office Workstations - Computer Security

The change that would result in all of the user devices being capable of seeing both corporate SSIDs is configuring both APs to use the 802.11ac wireless standard. 802.11ac is a wireless standard that operates in the 5 GHz frequency band and offers high data rates and performance. However, not all wireless devices support 802.11ac, especially older ones that only operate in the 2.4 GHz frequency band. In the table, AP1 uses 802.11b, which is an outdated wireless standard that operates in the 2.4 GHz frequency band and offers low data rates and performance. AP2 uses 802.11a, which is an older wireless standard that operates in the 5 GHz frequency band and offers moderate data rates and performance. Therefore, some user devices may not be able to see both SSIDs because they are incompatible with either 802.11b or 802.11a. By configuring both APs to use 802.11ac, which is backward compatible with previous wireless standards, all user devices should be able to see both SSIDs. Reference: CompTIA Network+ N10-008 Certification Study Guide, page 75; The Official CompTIA Network+ Student Guide (Exam N10-008), page 2-18.

The default priority value for spanning tree is 32768, regardless of the STP version (legacy STP, RSTP, MSTP, Per-VLAN STP, Per-VLAN RSTP). This value can be modified by the network administrator to influence the root bridge election. The priority value must be set in increments of 4096, which is the minimum unit of change for the priority value. https://community.cisco.com/t5/switching/spanning-tree-default-priorities/td-p/3304365

See the explanation for this solution
Explanation:
On the first exhibit, the layout should be as follows





Exhibit 2 as follows
Access Point Name AP2



Exhibit 3 as follows
Access Point Name AP3