In portrait the height is taller than its wide and in landscape the height is smaller than wide
so its the wider and taller
If you're using an apple product to do video editing, then iMovie is probably the best way to do that.
If you're on Windows and you're looking for a free video editing website, I'd suggest WeVideo. Although WeVideo does add watermarks to your videos, editing is pretty easy when using it.
C. system software
if it means drivers and so on
The answer is D. Appearance panel
