According to the Wi-Fi - Radio Modulation - TutorialsPoint document1, 64 QAM is a modulation method that will result in the highest theoretical data rates among the given options. 64 QAM uses both phase and amplitude modulation to encode six bits of information into each transmitted symbol. It can achieve up to 54 Mbps in the 802.11a and g systems.

Reference:
If you are the only tenant in a building that has Wi-Fi and you want to determine if a microwave oven is causing an issue with the Wi-Fi network appearing slow at times, you should look at the capacity/non-wifi interference SLE metric and classifier.
According to the Virtual Network Assistant | Juniper Networks US document, Non-Wi-Fi Interference is a classifier under the Capacity SLE that tracks devices that experience interference from non-Wi-Fi sources such as microwave ovens, cordless phones, or Bluetooth devices. This classifier can help determine if a microwave oven is causing an issue with Wi-Fi performance.

Reference:
According to the exhibit, Marvis determined that there were two authentication failures today for the client device. This can be seen from the red dots on the timeline chart that indicate failed events and from the event details that show authentication failure as the reason.

According to the Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide1, there are two ways to access Marvis, which is a virtual network assistant that provides insights and troubleshooting for wireless networks:
Use the conversational assistant, which allows you to ask natural language questions and get answers from Marvis.
Use Actions, which are predefined queries that you can select from a list and get results from Marvis.

Reference:
According to the Lecture 3 - Radio Frequency and Antenna Fundamentals - Part 2 document2, two layers of the OSI model where WLANs are located are:
Physical, which defines how data is encoded and transmitted over the wireless medium using radio waves.
Data Link, which defines how devices access and share the wireless medium using media access control (MAC) protocols.