Question: Why we need to create an index if the primary key is already present in a table? Question 4 1 options: Index improves the speed

Why we need to create an index if the primary key is already present in a table?
Question 41 options:
Index improves the speed of data retrieval operations on a table.
Indexes are special lookup tables that will be used by the database search engine.
Indexes are synonyms of a column in a table.
All of the above.

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