802.11n is a wireless standard that supports data rates up to 600 Mbps and operates in both 2.4 GHz and 5 GHz frequency bands. 802.11n is backward compatible with 802.11g, which operates only in 2.4 GHz band. 802.11n is the least expensive solution that can upgrade the wireless infrastructure for the company, as it does not require replacing all the access points or wireless devices

Seamless roaming is the ability of a wireless device to move from one access point (AP) to another without losing connectivity or experiencing delays1.
When multiple SSIDs are deployed in a wireless network, each SSID acts as a separate network with its own security settings, encryption methods, and authentication protocols2.
This means that a wireless device has to disconnect from one SSID and reconnect to another SSID when moving between different APs, which can cause interruptions and performance issues2.
By consolidating multiple SSIDs into one unique SSID, the technician can simplify the network management and improve the user experience2.
The wireless device can then associate with any AP that broadcasts the same SSID, and switch between them without re-authenticating or re-negotiating the security parameters2.
This enables seamless roaming and reduces the overhead and complexity of the wireless network2. Reference:
1: CompTIA Network+ N10-008 Exam Cram, 6th Edition, Chapter 6: Wireless Network Technologies, p. 212
2: CompTIA Network+ N10-008 Cert Guide, 1st Edition, Chapter 9: Wireless Network Design and Troubleshooting, pp. 367-368

SFP (Small Form-factor Pluggable) is a connector type that has the most flexibility. It is a hot-swappable transceiver that can support different speeds, distances, and media types depending on the module inserted. It can be used for both copper and fiber connections and supports various protocols such as Ethernet, Fibre Channel, and SONET. Reference: https://www.fs.com/what-is-sfp-transceiver-aid-11.html

An omni antenna should be used by the AP to provide service in a radius surrounding a radio. An omni antenna is a type of antenna that has a 360-degree horizontal radiation pattern. It can provide wireless coverage in all directions from the antenna with varying degrees of vertical coverage. It is suitable for indoor environments where users are located around the AP1. Reference: https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/82068-omni-vs-direct.html 1

A service-level agreement (SLA) is a document that states what the minimum performance expectations are within a network, such as uptime, throughput, latency, and security. An SLA is usually signed between a service provider and a customer, and it specifies the penalties or remedies if the service level is not met