Explanation
Single-mode fiber is a type of optical fiber that has a small core diameter and allows only one mode of light to propagate. This reduces signal attenuation and increases transmission distance, making it suitable for long-distance communication networks. Single-mode fiber can carry data over thousands of kilometers without requiring repeaters or amplifiers. Single-mode fiber is also immune to electromagnetic interference and has a higher bandwidth than multimode fiber. Therefore, single-mode fiber is the best cable type for connecting sites on multiple continents. References: [CompTIA Network+ Certification Exam Objectives],
[Single-mode optical fiber - Wikipedia]
Single-mode fiber optic cable uses a single ray of light to transmit data. This allows it to achieve very low attenuation and high bandwidth.
Multimode fiber optic cable uses multiple rays of light to transmit data. This results in higher attenuation and lower bandwidth than single-mode cable.
Twisted pair copper cable uses two insulated copper wires to transmit data. It is less expensive than fiber optic cable, but it has higher attenuation and lower bandwidth.
When choosing a cable type for a long-distance application, it is important to consider the following factors:
Attenuation: The amount of signal loss that occurs over the length of the cable.
Bandwidth: The amount of data that can be transmitted over the cable per second.
Cost: The cost of the cable and installation.
Single-mode fiber optic cable is the best choice for long-distance applications because it has the lowest attenuation and highest bandwidth of any cable type. However, it is also the most expensive cable type.

The network administrator should check the roaming settings on the APs and WLAN clients first. Roaming is the process of switching from one AP to another without losing connectivity. If the roaming settings are not configured properly, some users may experience poor connectivity when their devices stay connected to a distant AP instead of switching to a closer one. Reference: https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/82068-roam-faq.html

Explanation
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. References: CompTIA Network+ N10-008 Certification Study Guide, page 75; The Official CompTIA Network+ Student Guide (Exam N10-008), page 2-18.

API stands for Application Programming Interface, which is a set of rules and protocols that allow different software applications to communicate and exchange dat a. Network automation can use APIs to perform various automated tasks, such as configuring devices, provisioning resources, monitoring performance, and optimizing networks. APIs can enable network automation to interact with different network elements, platforms, and services, regardless of their vendor, technology, or architecture.
The other options are not correct because:
SSH stands for Secure Shell, which is a protocol that allows secure remote access to a network device. SSH can be used to manually configure and manage a network device, but it does not automate network tasks by itself.
CLI stands for Command-Line Interface, which is a text-based interface that allows users to interact with a network device by typing commands. CLI can be used to manually configure and manage a network device, but it does not automate network tasks by itself.
GUI stands for Graphical User Interface, which is a visual interface that allows users to interact with a network device by using icons, menus, and windows. GUI can be used to manually configure and manage a network device, but it does not automate network tasks by itself.

Explanation
VLAN hopping is a type of attack that allows an attacker to access or manipulate traffic on a different VLAN than the one they are connected to. One way to prevent VLAN hopping is to change the default VLAN on a switch. The default VLAN is the VLAN that is assigned to all ports on a switch by default, usually VLAN 1. If an attacker connects to an unused port on a switch that has not been configured with a specific VLAN, they can access or spoof traffic on the default VLAN. By changing the default VLAN to an unused or isolated VLAN, the network administrator can prevent unauthorized access or interference with legitimate traffic on other VLANs. References: https://www.comptia.org/training/books/network-n10-008-study-guide (page 308)