Given that hardware upgrades are not an option, the best configuration to provide a solution for increased bandwidth on wireless laptops is Channel bonding. Here's why:
Increasing RSSi: RSSi (Received Signal Strength Indicator) is related to signal strength but does not directly address bandwidth limitations.
MIMO (Multiple Input, Multiple Output): While MIMO improves throughput, it requires compatible hardware on both ends (access points and client devices). Since hardware upgrades are not allowed, MIMO is not a viable solution.
Channel bonding: This technique combines multiple adjacent channels to increase overall bandwidth. By using multiple channels simultaneously, the available bandwidth can be expanded without changing the hardware.
Reconfiguring SSID: Changing the SSID (Service Set Identifier) won't directly impact bandwidth; it only affects network identification.
Therefore, the correct answer is C. Channel bonding2.

Changing the default password is a hardening technique that best mitigates the use of publicly available information, such as vendor documentation, online forums, or hacking tools, that may reveal the default credentials of a commercial switch. By changing the default password to a strong and unique one, the network technician can prevent unauthorized access to the switch configuration and management.
Reference:
Network Hardening - N10-008 CompTIA Network+ : 4.3 - YouTube1
CompTIA Network+ Certification Exam Objectives, page 151

In this case, the most likely cause of the constant disconnections when moving from one location to another is likely due to a problem with the roaming functionality of the wireless network. The setting that would likely provide better network stability in this situation is the RSSI roaming threshold, which determines the signal strength required for a client device to remain connected to the wireless network. If the roaming threshold is set too low, the client device may disconnect and reconnect to the network too frequently as it moves between different access points. On the other hand, if the threshold is set too high, the client device may not roam to a new access point when necessary, leading to a loss of connectivity. Adjusting the RSSI roaming threshold to an appropriate value may help to improve the stability of the wireless network in this situation.

NetFlow is a protocol that collects and analyzes network traffic data, such as source and destination IP addresses, ports, protocols, bytes, packets, and flows12.
NetFlow data can help identify the volume, type, and direction of network traffic, as well as the applications and hosts that are generating or consuming the most bandwidth12.
By collecting NetFlow data from the router, the network administrator can provide evidence to confirm that the recent network outages were caused by increased traffic from a specific application or host12.
Generating a network baseline report, exporting the firewall traffic logs, or plotting interface statistics for dropped packets may also provide some useful information, but they are not as specific or comprehensive as NetFlow data12. Reference:
1: CompTIA Network+ N10-008 Exam Cram, 6th Edition, Chapter 5: Network Traffic Analysis, p. 203-204
2: CompTIA Network+ N10-008 Cert Guide, 1st Edition, Chapter 9: Network Monitoring and Performance Optimization, p. 409-410

A broadcast storm is a situation where a network is flooded with broadcast packets, which are sent to all devices on the network. This can consume bandwidth, cause congestion, and degrade performance. A broadcast storm can be caused by improper network configurations, such as loops or misconfigured switches. In this scenario, the old switches may have created loops or failed to filter broadcast packets, resulting in a broadcast storm that overwhelmed the network.