A.They accept only a single argument 
B.They can be nested only to two levels 
C.Arguments can only be column values or constants 
D.They always return a single result row for every row of a queried table 
E.They can return a data type value different from the one that is referenced

A.SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_credit_limit DESC
B.SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_credit_limit
C.SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_credit_limit NULLS LAST
D.SELECT cust_last_name, cust_credit_limit FROM customers ORDER BY cust_last_name, cust_credit_limit NULLSLAST