https://foxonline.temple.edu/guides/zoom/virtual-backgrounds/
Recommended To achieve the best virtual background effect, Zoom recommends using a solid color background, preferably green Higher quality cameras result in a better virtual background Use uniform lighting and color Do not wear clothing that is the same color as the virtual background A background image with an aspect ratio of 16:9 and minimum resolution of 1280 by 720 pixels. Sources for ...
https://sites.temple.edu/rtassessment/files/2018/10/MoCA-Instructions-English_7.2.pdf
Give no (0) points for no correct subtractions, 1 point for one correction subtraction, 2 points for two-to-three correct subtractions, and 3 points if the participant successfully makes four or five correct subtractions.