Considering Aggregates and the SQL Tool, which of the following is the correct option?

Considering Aggregates and the SQL Tool, which of the following is the correct option?
A . The SQL Tool allows to write queries that contain sub-queries.
B. Joins between entities can only be defined in Aggregates.
C. All queries that can be written in an SQL Tool can be defined in an Aggregate.
D. Attribute grouping can only be done with the SQL Tool.

Answer: A