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A DBMS guarantees every record in a table is unique by adding a:

AProduct batch
BPrimary key
CPrivate line
DPrinted label
Answer & Solution
Correct answer: B. Primary key
1. Two identical rows would be ambiguous. 2. One column must identify each row. 3. That column is the primary key. _Source: OpenStax Introduction to Computer Science, Chapter 8, Data Management._
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