Final answer:
The correct statement about the join syntax of an Oracle Proprietary join syntax SELECT statement is that the ON keyword must be included.
Step-by-step explanation:
The correct statement about the join syntax of an Oracle Proprietary join syntax SELECT statement is option C. The ON keyword must be included.
When using Oracle's proprietary join syntax, the join criteria is specified using the ON keyword. This keyword is used to define the conditions that determine how the tables are joined.
For example:
SELECT * FROM table1 JOIN table2 ON table1.column = table2.column;