Which three statements about Subqueries are true? (Choose three). | Oracle

A. A single row subquery can retrieve only one column and one row
B. A single row subquery can retrieve only one row but many columns
C. A multiple row subquery can retrieve multiple rows and multiple columns
D. A multiple row subquery can be compared using the ">" operator
E. A single row subquery can use the IN operator
F. A multiple row subquery can use the "=" operator

Ans: B,C,E