Which two statements are true regarding the USING clause in table joins?(Choose two.)
A.
It can be used to join a maximum of three tables.
B.
It can be used to restrict the number of columns used in a NATURAL join.
C.
It can be used to access data from tables through equijoins as well as nonequijoins.
D.
It can be used to join tables that have columns with the same name and compatible data
types.
C, D I think
http://www.aiotestking.com/oracle/which-two-statements-are-true-regarding-the-using-clause-in-table-joins/
C is also incorrect.
An equijoin is a join with a join condition containing an equality operator (=).