Question: Which statement below about subqueries is accurate? When using a subquery in a SELECT statement, it must return a single value. Subqueries are only used

Which statement below about subqueries is accurate?
When using a subquery in a SELECT statement, it must return a single value.
Subqueries are only used in the SELECT, WHERE, and HAVING functions.
A subquery is a non-nested query.
A WHERE subquery does not save computation time when compared with a JOIN.

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