(consider table A and table B) Which of the following command will return a new table that has one column with 3 records?Required to answer. Single choice.

select studentid from A,B;

select studentid from A,B where A.studentid=B.studentid;

select A.studentid, name from A,B;

select studentid from A union select name from B ;

select studentid from A union select studentid from B ;