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In a printed table diagram, the primary key is usually shown:

AUnnumbered
BUnderlined
CUpside down
DUppercase
Answer & Solution
Correct answer: B. Underlined
1. A visual cue marks the key column. 2. The convention is a line beneath it. 3. So it is underlined. _Source: OpenStax Introduction to Computer Science, Chapter 8, Data Management._
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