Explanation:
: Table names and column names must begin with a letter and be 1-30 characters long. Characters A-Z,a-z, 0-9, _, $ and # (legal characters but their use is discouraged). Incorrect answer :
2: Non alphanumeric character such as “*” is discourage in Oracle table name.
4: Table name must begin with a letter.
Reference:
Introduction to Oracle9i : SQL, Oracle University Study Guide, 9-4

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