Which two statements are true about the ORDER BY clause when used with a SQL...

Column positions must be used in the ORDER BY clause

Only column names from the first SELECT statement in the compound query are recognized

The first column in the first SELECT of the compound query with the UNION operator is used by default to sort output in the absence of an ORDER BY clause

Each SELECT statement in the compound query must have its own ORDER BY clause

Each SELECT statement in the compound query can have its own ORDER BY clause