Which of the following statements is correct?

A.
All JOIN operators can be expressed as a combination of SELECT statements and cartesian
products

B.
The cartesian product of 2 sets will never have duplicate rows

C.
INNER JOIN and OUTER JOIN of 2 tables will always be different

D.
Adding GROUP BY to a SELECT statement will always return less rows than the same
SELECT statement without the GROUP BY clause.

Explanation: