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Applying the Project operator to a relation returns a subset that is:

AVolatile
BVolumetric
CVoluntary
DVertical
Answer & Solution
Correct answer: D. Vertical
1. Select cuts rows out of a relation. 2. Project instead keeps only chosen columns. 3. So the result is a vertical subset. _Source: OpenStax Introduction to Computer Science, Chapter 8, Data Management._
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