Which of the following is NOT a typical aspect ratio for digital video?

• A. 2:1
• B. 16:9
• C. 4:3
• D. 21:9

Answer: (A)

Digital video commonly uses 16:9, 4:3, and 21:9 as standard formats. 16:9 is the dominant ratio for HDTV, streaming, and modern cameras; it’s what most displays and delivery platforms expect. 4:3 comes from older standard-definition television and is still seen in some archival or retro content. 21:9 is an ultrawide “cinematic” look that many productions shoot for or deliver in to achieve a widescreen effect and it’s supported by many editors and monitors today. The ratio that isn’t a typical standard for general digital video is 2:1; it’s not a mainstream delivery or presentation ratio, and while it may appear in some niche workflows, it’s not part of the common set used for most digital video projects.