Explanation:
This option is used to check character set compatibility between the export file and the target database. Incorrect Answer:
1: It is not used to verify space requirements because data was not loaded.
2: It is not used to generate the SQL for the DDL operations that would occur during import.
4: Since there was not data load it does not provide you with integrity constraint violations.
Reference:
OCP Oracle 9i Database: Fundamentals II Exam Guide, Rama Velpuri, p. 449-462
Chapter 19: Loading Data into a database

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