Ultra HD (UHD), also referred to as 4K UHD, has a resolution of 3840x2160. It's four times the resolution of standard 1080p (Full HD), offering more screen real estate and sharper images.
Option A (1920x1080): Full HD (FHD), not UHD.
Option B (2048x1080): DCI 2K — used in cinema, not common for Ultra HD.
Option D (7680x4320): Known as 8K UHD, not standard Ultra HD.
CompTIA A+ Core 1 Exam Objective Reference:
Objective 1.7: Compare and contrast display technologies and their features.
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