Explanation:
Correct syntax to create a local synonym is CREATE SYNONYM synonym_name. With PUBLIC keyword you can create public synonym.
Incorrect Answers:
1: There is no PRIVATE keyword for the CREATE SYNONYM command.
3: There is no LOCAL keyword for the CREATE SYNONYM command.
4: This SQL statement shows incorrect syntax to create a synonym.
5: Synonyms can be created not only for tables but for other objects also.
6: Scott can create synonym for Mary’s view because she granted SELECT privilege to Scott on this view.
OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 331-335
Chapter 7: Creating Other Database Objects in Oracle

---