Explanation:
: The only SQL*Plus command in this list : DESCRIBE. It cannot be used as SQL command. This command returns a description of tablename, including all columns in that table, the datatype for each column and an indication of whether the column permits storage of NULL values. Incorrect answer:
1: INSERT is not a SQL*PLUS command
2: UPDATE is not a SQL*PLUS command
3: SELECT is not a SQL*PLUS command
5: DELETE is not a SQL*PLUS command
6: RENAME is not a SQL*PLUS command
Reference:
Introduction to Oracle9i : SQL, Oracle University Study Guide, 7

---