[Solved] What is the method of specifying a primary key in a schema description?

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Q.	What is the method of specifying a primary key in a schema description?
A.	By writing it in bold letters
B.	By underlining it using a dashed line
C.	By writing it in capital letters
D.	By underlining it using a bold line
Answer» D. By underlining it using a bold line

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